Three distinctive types of sexual homicides of men were identified: (1) the avenger; (2) the sexual predator; and (3) the nonsexual predator. After describing the general trends in the sexual murder of men, each of these three types of sexual homicide perpetrators is described, including their motivation and the characteristics of the criminal event. The avenger type of sexual murderer tends to be involved in prostitution and have substance abuse problems. Most experienced different forms of abuse during childhood. The motivation to murder may be to avenge himself of all past victimizations. Anger usually precedes the event and a weapon of opportunity is generally used. The sexual predator, on the other hand, is motivated by deviant sexual fantasies and he may have committed past sexual offenses against children. The victim is usually abducted and the event is marked by sadistic acts. The nonsexual predator is not motivated by deviant thoughts or by anger. Instead, this type of homicide tends to be accidental or instrumental. The principle motivation in most cases is to rob the victim, which then degenerates into homicide due to victim resistance. In most cases, the victim is not sexual assaulted, although sexual contact between the victim and offender may occur to manipulate the victim. Future research should continue to gather empirical evidence about this rare but very serious crime. Participants were 10 sexual murderers incarcerated in Quebec, Canada between 1998 and 2000. Participants completed interviews regarding the specifics of their crime, disinhibitors such as deviant sexual fantasies and substance abuse, occupational problems, relationship problems, and victim characteristics. The institutional files of the participants, the police reports, and in some cases the autopsy reports were also reviewed. Tables, note, references