Richard "Iceman" Kuklinski
An especially loathsome and creative killer, Richard "Iceman" Kuklinski, nicknamed so because of his method of freezing bodies to throw off forensic scientists trying to determine the time of death, claimed to have murdered over 100 men. In a chilling and controversial jailhouse interview conducted by psychiatrist Dr. Park Dietz, Kuklinski described the various methods he used to execute his victims, from poison, to hand grenades, to leaving a tied-up victim in a rat-infested cave. After a 30-year career as a hit man, Kuklinski was arrested in 1986, and in 1988 convicted of five murders and sentenced to life in prison, where he remained, surrounded by publicity, until his 2006 death at the age of 70. Kuklinski's death was regarded as suspicious because he was slated to testify at Gambino underboss Sammy "The Bull" Gravano's trial for the killing of NYPD detective Peter Calabro. Gravano, who Kuklinski claimed ordered him to commit the murder, was imprisoned on another charge at the time, and after Kuklinski's death, prosecutors decided there was not enough evidence to continue the Calabro trial.