Sadipaths are the worst of all offenders. They are callous, vicious, and lacking in remorse. This study investigated the beliefs and familiarity that people have with 10 infamous serial killers. The final sample of 455 participants revealed some notable findings regarding various demographic variables and familiarity with serial killers. Ted Bundy, Jeffrey Dahmer, and Richard Ramirez were the three most well-known sadipaths. The findings also show that the majority of people do not believe these offenders can be rehabilitated (78.4%) and that most believe they should face the death penalty (65.6%). Most (77%) also believe they have sadistic personalities. The study may be of interest to psychologists, criminologists, lawyers, and social scientists.