The purpose of this study was to examine the effects of police systems and their environments on police homicides. Data from five sources, the Crime Control Institute, International Association of Chiefs of Police, Joint Center for Political Studies, Police Executive Research Forum, and the United States Bureau of the Census were used to create the database which included information on police systems, their environments and reported police homicides. This study provided an exploratory analysis of the effect, if any, of the following on police homicides: (1) police administrative review and investigation policies, (2) firearms training standards, (3 ) police system resources (4) demographic community characteristics, (5 ) political community characteristics, and (6 ) community crime characteristics. The most significant findings of the research were the following: (1) In a multivariate analysis of police homicides, the civilian homicide rate was the best predictor of police homicides. (2) There was no significant association between restrictiveness of review and investigation policies (Control), moral, legal and ethical aspects of firearms training, financial resources or education of sworn personnel and police homicides. (3) Race as a system environment variable was correlated with other environment variables at the zero order level but not significant in the multivariate analyses. (4) Civilian Homicides, Race, Black Political Empowerment and Family Ratio were moderately associated with police homicides at the zero order level. (5) Demographic characteristics had little, if any, effect on police homicides. (6) Interjurisdictional variation existed not only in police homicides but also in system management, resources and environments. These findings suggest that police system environmental factors are the best predictors of police homicides. While police departments should continue to strengthen the internal management of police homicides through policies and training, they should include other approaches to controlling and preventing police homicides. One approach should be the development of a model program to educate officers and civilians on police use of deadly force. These programs should focus on (1) attitudes and fears of police officers towards Black citizens and vice versa (2) human relations training and (3) the role of community violence in police violence. The systematic collection and dissemination of police homicide data is essential to future police use of force research. The data should include fatal and nonfatal shootings and be easily accessible. Future research should examine race as an organizational factor. Analyses of the effect, if any, of racial attitudes of police officers and racial composition of police departments on police homicides are needed.