Trends of homicidal deaths in central Bangkok, Thailand: a 5-year retrospective study
© The Author(s) 2018
Received: 20 October 2017
Accepted: 23 January 2018
Published: 2 February 2018
The aim of this study was to analyze the trends related to homicide victims in central Bangkok, Thailand. These trends were analyzed in terms of general figures and demographics, as well as case-specific details such as time, day, month, weapon, cause of death, location of injury and toxicology. Data was collected using autopsy archives from 2009 to 2013 and specific details were recorded and analyzed statistically.
Major trends identified included generally decreasing rates of homicide, larger proportions of male victims, higher rates of homicide during the hotter months of the summer, and the most common weapon being firearms and sharp force. Also consistent with global trends is a majority of victims being unmarried. Unique to the Thai population, due to social and legal factors, included the frequency of firearm and sharp force injuries, as well as methamphetamine being the most common psychoactive substance found in victim toxicology. Furthermore, many unique points, such as the correlation between the cause of death and the type of force, were made.
Several characteristics of homicide that are similar to global trends have been found in this study. However, some trends were found differed from other countries included the anthropometric data, the types of forces and its relationship to location, as well as which psychoactive substances were detected.
A homicide is defined as the “killing of one human being by another” (Merriam-Webster 2016). According to the United Nations Office on Drugs and Crime (UNODC), intentional homicide was the cause of death in almost half a million people globally in 2012 (United Nations Office on Drugs and Crime 2014). This equates to a homicide rate of 6.2 per 100,000 people. There are disparities between different regions around the world within these trends in homicide figures and rates. According to the UNODC 2014 Homicide Statistics, Thailand’s intentional homicide rate amounted to 5.0 per 100,000 population, with Bangkok having rates as high as 4.4 per 100,000 in 2006. Overall, Asia’s intentional homicide rates are much lower than other regions such as Central and South America. However, Thailand’s rate is considerably higher than in some other Southeast Asian countries, such as Timor-Leste and Singapore, whose rates are 3.6 and 0.2 respectively (United Nations Office on Drugs and Crime 2014).
Current data may be limited in that it does not include characteristics and the mechanism of homicide, as well as profiling of the victims and the crime itself. Such fatal violence not only triggers fear among communities, but also victimizes many individuals, including the family of the victim. Having as much data as possible on the homicides occurring in Bangkok, or in any city, can prove to be a valuable tool for raising awareness about the statistics of homicides in the community. Furthermore, making information about such crimes available can serve as a prevention and reduction tool so that individuals in the community can take certain measures to reduce risk factors associated with homicidal crimes. Such data can also serve as a catalyst for policy change in areas such as gun control or substance abuse.
As such, there is great interest in the general trends and figures in homicide rates, including time (which includes year, month, day, and period of the day), region, and mechanism. Additionally, victims were profiled according to sex, age, occupation, marital status, birthplace, build, height, weight, and body-mass index (Kumar et al. 2005; Mohanty et al. 2005; Ambade et al. 2007; Cocks and Saayman 2013). It is our hope that this data will provide useful forensic insight into homicide characteristics in Bangkok, Thailand’s capital city. These findings will also help shape an understanding of other Asian regions, specifically Southeast Asia, where most countries are developing countries and still have problems with violence. Findings will also help inform how a country’s features and idiosyncrasies (socioeconomic, cultural, legal, etc.) may affect its homicide characteristics. An understanding of these relations would then help inform policy effectiveness and how best to reduce crime globally.
Homicide case data was collected from autopsy archive in Ramathibodi Hospital, which covers seven districts of Bangkok—Phayathai, Rajathevi, Huaykwang, Dindaeng, Dusit, Bangsue, and Pomprabsatrupai—all located in the center of Bangkok city, included 641,240 from total 5,686,252 individuals in 2013 (Bangkok Metropolitan Administration 2013).
Screening for homicide cases was done from the total 3430 unnatural deaths (including homicides, suicides, accidents, and all unexplained deaths) that were investigated at the hospital between 2009 and 2013. All homicidal case data from the hospital forensic department’s autopsy archives were included to this study.
The reported cases relating to the 2010 political riots in Bangkok were excluded from this study as they were classified as mass casualties and occur only every few decades. However, there is a report about the characteristics of that event elsewhere (Peonim et al. 2016). Furthermore, homicide cases classified as extra-judicial killings were excluded from analysis. These cases were considered anomalies to the general population analysis of homicides and had the potential of skewing the trends and data obtained.
Reports for homicide cases were subsequently analyzed for information regarding sex, age, victim profile (occupation, marital status, birthplace, build, height and weight), and crime profile (mechanism of injury, time of death, day of week, month, year and toxicology), which may have been recorded from the victim’s identification card, death certificate, police report, or the autopsy report itself. Where possible, other relevant information was noted as well.
The data was recorded on a form created to compile each victim’s autopsy profile. Subsequently, data was analyzed for statistical figures when applicable. This information was then compared to any available literature.
Summary of numbers of cases
Homicide cases (males)
% Homicide cases
Amount of homicides by month and season
Amount of homicides by month (%)
Amount of homicides by season (%)
Cause of death categorized by type of force and location
Cause of death
Type of force
Manual/ Ligature Strangulation
The death by head trauma was found correlated with blunt force injury with statistical significant (p < 0.001, Pearson Chi-Square test). The death by chest trauma and abdominal trauma were also statistical significantly correlated with sharp force injury (p = 0.008 and p = 0.026, respectively). In addition, the death by neck injury was correlated with strangulation (p < 0.001) as the neck was involved in all cases that were dead by strangulation.
The anthropometric data categorized by location and type of force
Type of force
Alcohol content in victims
Blood alcohol content positive (%)
Intoxicated (> 50 mg%) (% of positive cases)
Intoxicated (> 150 mg%) (% of positive cases)
Average blood alcohol content of those with alcohol content (SD) (mg%)
2009 (n = 28)
2010 (n = 30)
2011 (n = 22)
2012 (n = 22)
2013 (n = 17)
Total (n = 119)
List of substances found in toxicology reports
% of total (n = 119)
Having and understanding homicide trends can be helpful in curbing preventable violent crime in a city, which was the intent behind this study. The results of this retrospective study provide unique comprehensive details, not only with regard to demographics, but also concerning victim profiles and their respective homicide profiles. The data and analysis are detailed enough to provide depth, but also are broad enough to create a general overview, which may inspire further study into certain aspects of homicides in Bangkok and cities with similar demographics.
The male-to-female ratio in our study was 5.6:1, slightly lower than findings at the same hospital earlier, from 2003 to 2007, which found a male-to-female ratio of approximately 8.1:1(Pattarapanitchai et al. 2010). The high male-to-female ratio is consistent data presented in the Global Study on Homicide(United Nations Office on Drugs and Crime 2014) as well as with studies in other international cities, including Kuala Lumpur (Kumar et al. 2005), a somewhat comparable city, as it is a major city located in the same region of Southeast Asia, as well as Pretoria (South Africa) and several cities in India (Mohanty et al. 2005; Ambade et al. 2007; Cocks and Saayman 2013).
Findings by Roth (2012) showed that the percent of male homicide victims exceeded that of women consistently around the world, with larger differences between males and females in low and middle-income countries(Roth 2012). Our findings of a steep male-female ratio of homicide victims in Thailand, an upper middle-income country since 2011 according to the World Bank (The World Bank 2016), support this. Earlier findings of a slightly steeper homicide sex ratio, closely following the country’s economic growth and this victim sex ratio which could further affirm or dispel Roth’s findings, may prove to be an impactful sociological phenomenon to study.
According to the U.S. Department of Justice, vulnerability to violent crime victimization generally decreases with age after a peak in the teenage years (Perkins 1997), which may partly explain the slightly right-skewed age distribution as seen in Fig. 1. Again, this trend may be a result of lifestyle factors such as socialization patterns, drug/alcohol use, impulsivity, etc., even though the differences between the general population and homicide victim ages are most likely not drastic enough to be a critical aspect of victim vulnerability. Compared to data reported by Eisner (2003), the average victim age in the United States was 32.3 years and 34 years in Stockholm, similar to our findings (33.4 years)(Eisner 2003). Eisner reports that this number has generally not changed since the sixteenth century. Therefore, it is clear that our data is consistent with not only Thai demographics but also the profile of typical homicide victims as reported by several years of data collection.
Our findings are consistent with the popular assumption that people who are in non-married marital statuses (single or divorced/separated) are at greater risk of homicides. According to a study of male homicide victims in the United States, non-married individuals have a higher relative risk, once fitted to the Cox proportional hazards model, along with other covariates like social isolation, education, and employment status(Kposowa et al. 1994). Because this phenomenon is consistent globally, there is reason to believe that the social mechanism underlying the trend is the same throughout. The authors of the study have speculated that this trend can be explained by Durkheim’s theory relating attachment to crime, although there is not much evidence to support this. It is also unclear if the high incidence of homicide among single men is due to their marital status or because they were young (Froeling 2007).
Trends pertaining to the victims’ place of birth are also consistent with the movement of Thai people, notably the urban agglomeration of Bangkok by people from the Northeast. The greatest proportion of victims in this study being from central and northeastern Thailand is consistent with population data, in that the largest segments of the population of people living in Bangkok are those from the central and northeastern areas of the country(Tangcholthip 2006). These trends suggest that there is no apparent demographic targeting of homicide victims, but rather that homicide victims are targeted either randomly or for other reasons not related to place of birth. Burmese and Cambodian victims found in this study may be explained by their migration to Thailand seeking employment, mostly as general employees.
The homicide victims’ average BMI fell within the WHO’s normal Asian BMI range of 18.5–25(Barba et al. 2004). However, there was a significantly larger proportion of both male (15.8%) and female (33.3%) victims with a BMI less than 18.5 compared to their respective national averages (9.4% and 7.6%, respectively) Aekplakorn 2010. This difference was much more pronounced for female victims. Previous research on American women has shown a positive correlation between BMI and crime victimization and having encountered homicide attempts(Brewerton et al. 2015), contrary to our victim BMI distribution. Because the number of female victims is relatively low compared to male victims, such correlation with crime victimization may not be very strong. However, given the existing trends and large discrepancy between underweight victims compared to the national average, there may be a systematic explanation, whether sociological, psychological, or biological, for this phenomenon.
Most publications on homicide victimology have not focused on the demographics or anthropomorphological characteristics of the victims, therefore making it difficult to establish or confirm any trends. However, such characteristics reveal that some of the statistics of homicide victims deviate from the general population.
Our findings are consistent with other studies about increases in violent crimes during the summer/hotter months(Anderson 2001) (April, the hottest month in Thailand, had the largest number of homicides). However, it can be seen that the gaps between the different seasons of the year are not significantly large, with the late rainy season of September to November having almost as many cases. It has been found that, statistically, warmer cities do not experience as much change in terms of the number of crimes(Ranson 2014), which may explain the generally even monthly distribution of homicides.
Furthermore, there are several interesting aspects included in our study which are rarely studied extensively. For example, the date interval in which the homicide cases occurred presents an interesting issue. There may possibly be a socioeconomic explanation behind why the last third of the month had the lowest homicide frequency, but further studies with larger sample sizes, as well as a more detailed exploration of the issue, may be needed to present a conclusive answer. With this, it may also be important to further note any special holidays, to observe whether or not a correlation between the occasion and the homicide numbers exists. Additionally, our findings of more homicides during the night time are confirmed by numerous statistics of time correlation regarding violent crime in adult offenders (Office of Juvenile Justice and Delinquency Prevention 2014). The peak time in homicides occurring at night in our study may possibly be explained by alcohol consumption leading to aggression, or by greater convenience for escape of criminals. Both hypotheses are currently understudied, and thus if extensively studied, may yield beneficial information to help mitigate issues of violent crime.
Analysis of the weapon used in each case has also demonstrated results consistent with previous studies(Kristoffersen et al. 2014). The finding that gunshot wounds are the most common type of force is consistent with the research showing firearms as the most commonly used weapons to kill victims in many countries, including the United States (Pettler 2015) and Italy (Verzeletti et al. 2014). Compared to the United States, we see that the murder weapons used in our cases seem to be more evenly spread, whereas in the United States, in 2014, firearms were responsible for approximately 67.9% of homicide cases reported, followed by the use of knives or cutting instruments, blunt objects, and personal weapons (Federal Bureau of Investigation 2014). Findings of minority groups, such as indigenous South Australians, suggest that gunshot deaths there were different, where firearm deaths were slightly less common than blunt and sharp force trauma (Temlett and Byard 2012). From these differences, it is evident that injury mechanism distributions depend on pragmatic factors, such as what resources are available in each culture.
Interestingly, although gunshot wounds and sharp force were the most common types of force used, this was not the case for head trauma. Even though head gunshot wounds have very high mortality rates (Spitz and Spitz 2006), the chest was more commonly affected by gunshot wounds in this study. Blunt force injury to the head was significantly more common in our study, which is consistent with previous findings that the head is the most common site of fatal blunt force injuries(Ambade and Godbole 2006). However, contributing factors may include the difficulty of using sharp objects to penetrate the skull, the availability of multiple objects, and the ability to use bare hands to cause fatal injuries to the head.
Similar to firearm trends in other countries mentioned(Myint et al. 2014), it is evident that firearms contribute significantly to homicide rates in Bangkok. It has been recently reported that Bangkok has a high per capita gun-murder rate when compared with other Asian countries like Brunei, Singapore, India, and China(United Nations Office on Drugs and Crime 2014). Studies have found a correlation between gun availability and homicide rates, notably in countries such as the United States where such weapons are available for purchase by the general population. Although much less than the United States, Thailand’s private gun ownership (both licit and illicit) is 15.6%, putting it at 11th globally in terms of the number of privately owned guns, and 39th globally in terms of rate of private gun ownership, as of 2007 (Alpers and Wilson 2016).
Additionally, it has been found that income inequality and social capital, when other factors like poverty and firearm availability are controlled for, is related to firearm violent crime (Kennedy et al. 1998). Given that income inequality in Thailand is growing and is among the highest in Southeast Asia (Bird et al. 2011), the high firearm homicide proportion may not be entirely surprising. However, it is also very likely that because Bangkok’s poverty is much lower compared to other regions of Thailand, and due to its homogeneous characteristics, this relationship with income inequality is moderated, precluding firearm deaths from being much greater than deaths due to other mechanisms, like sharp force. Nevertheless, these findings are alarming, and it may be useful to further study whether policy changes regarding gun ownership and use should be made. Additionally, policies that address broader issues like income inequality may also prove to be beneficial and of interest to the government.
Our study found that the death from head trauma was statistical significantly correlated with blunt force injury while the death from chest trauma and abdominal trauma were statistical significantly correlated with sharp force injury. These findings confirmed the previous study (Ambade and Godbole 2006) that the head is an important target of attack with the fists or weapons without sharp edge while the chest and abdomen were most targeted by sharp or piecing weapons.
For the anthropometric data and the cause of death, it was surprising that persons who died from chest trauma had higher average weight than other traumas statistical significantly. It was possible that the chest is a prominent and wide target area in the man with large body. On the other hand, it was not surprising that the deceased who was dead from blunt force injury had lower weight than the other types of force statistical significantly. This could be because the smaller persons have a tendency to be assaulted or bullied by others (White and Mason 2012).
In cases where toxicology was analyzed, a large proportion was deemed alcoholic intoxication. This may implicate alcohol use as a correlate of aggressive behavior, as previous studies have found, and that alcohol may lead to poor judgment and decision-making(Hedlund et al. 2014) in addition to homicidal activities (Parker and Cartmill 1998). Compared to other substances found, alcohol made up a large majority, which is consistent with past studies(Verzeletti et al. 2014). With a number of victims being deemed intoxicated, anger or poor judgment during a drunken altercation may be possible factors for homicide on the part of both perpetrator and victim.
The presence of drugs in homicide victims such as those found in approximately a quarter of the victims in our study can be indicative of several factors related to homicide. Psychoactive substances are linked to certain distal factors, such as lifestyle and systemic violence, which may increase the risk for violence and homicide. Additionally, there is a strong association between offenders and victims in terms of co-intoxication (Darke 2010). Therefore, toxicology results can provide not only good insight into circumstances around the case, but also serve as markers of violence and the manner of death. Trends in common drugs found in homicide victims have been found to vary across different cultures(Darke et al. 2009). For this study, the most common drug found being methamphetamine is not a surprising result, as it has been shown that Ya Ba, which is the Thai name referring to methamphetamine tablets, is the most widely consumed illicit drug in Thailand, with consumption on the rise among teenagers (Windle 2015).
Additionally, a link has been drawn previously between drug use and firearm deaths (Darke 2010), which may be explained by distal factors such as a predisposition for violence in drug users, leading to firearm-related violence. Our study found both high amounts of firearm deaths as well as a relatively significant amount of psychoactive drugs present in toxicology reports. Such findings, in addition to Thailand’s current fight against both drugs and firearm violence, suggest a need for further study as well as adjustment in policy. Addressing either or both may prove to be beneficial in reducing homicide rates, as well as crime in general.
However, it is also important to note that multiple cases did not have toxicological (and alcohol content) data, as the attending pathologist did not suspect alcohol content or psychoactive substances to be of concern. Evidently, the data available for analysis was not extensive, and therefore a more detailed analysis with a larger sample size would be required to confirm the relationship between alcohol and drugs in the victims, and the circumstances surrounding their homicide.
As seen, many perspectives are provided related to homicides and their circumstances. Several known trends, like cause of death pertaining to specific organ locations, where head injuries are the most common cause, are also consistent with other studies (Vij et al. 2010; Kristoffersen et al. 2014). Other trends that show cultural variation, such as psychoactive substances as well as those that have not been extensively studied in the past were also studied here. Many of these trends are significant and may have larger implications on public policy as well as law enforcement tactics.
However, due to the limited number of cases available, as well as limited or inconsistently available data on crime elements such as location of death, the ability to definitively conclude correlation or causation is reduced. Additionally, due to limitations of case data, especially court verdicts and final investigative conclusions, we are unable to produce the whole picture for characterizing homicides in Bangkok. However, it should also be noted that the jurisdictional area in this study, representing 7 of the 50 districts in Bangkok, are centrally located with a dense population, ensuring the generalizability of the trends we have presented.
Through our retrospective analysis of homicide cases from 2009 to 2013, we were able to confirm several trends, including demographic trends and seasonal patterns, as well as identifying interesting deviations from such trends.
Several characteristics of homicide that are similar to global trends have been found in this study, including occurrence in the summer, and alcohol and drug use. Other risk factors consistent with global trends that were found include being male and unmarried. Other trends which were explored that differ from other countries included the types of forces (mostly gunshot and sharp force injuries) and its relationship to location (notably blunt force injury at the head trauma and sharp force injury and the chest and abdomen trauma), as well as the anthropometric data and the correlation to the cause of death (notably heavy weight associated with chest trauma and light weight associated with blunt force injury). The psychoactive substances were also detected in the victims, especially methamphetamine. However, these differences may be linked to local characteristics such as laws and pragmatic factors like weapon or drug availability. We hope that our findings serve to not only inform people of existing trends relating to homicides in Bangkok, but also as a source of discussion for the public to generate positive change in our country.
The authors would like to thank our colleagues, including Forensic Division staff and officers, for the support they have given us.
The authors declared no funding.
Availability of data and materials
VS is initiating the study, collecting the data, analyzing the data and writing the manuscript. WW is registering to the ethical approval committee, analyzing the data, writing the manuscript and submitting the manuscript. VP is initiating the study and guiding the study design. All authors read and approved the final manuscript.
Ethics approval and consent to participate
The analyses in this report have been approved by the Ethical Clearance Committee on Human Rights Related to Research Involving Human Subjects, Faculty of Medicine, Ramathibodi Hospital, Mahidol University (MURA2016/457 N1).
Consent for publication
The authors declare that they have no competing interests.
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