His victims were all people he deemed to have violated his self-constructed moral code — a pattern of judgment and violence that played out across four murders spanning fifteen years in the Aosta Valley. The crimes followed a consistent structure: sexual encounter, perceived grievance, killing, and systematic destruction of remains. A psychiatric evaluation found him partially lacking in understanding and volition, yet he operated methodically enough to evade detection for years, even signing a court-ordered register the same day he concealed a victim's body.

Healthcare killers occupy a particular category of historical infamy because their crimes invert the trust placed in a caregiver by patients at their most vulnerable. Majors worked as a licensed practical nurse at a small Indiana hospital during the early 1990s, and the spike in patient deaths that coincided with his shifts drew eventual scrutiny from investigators. Convicted of six murders and tried for seven, the suspected total of deaths attributed to his presence on the ward was considerably higher, underscoring how institutional settings can delay or complicate the detection of such patterns.

Casey's public profile was built on moral authority — a prominent Irish bishop, a champion of global justice causes, a familiar face in the media — which made the eventual accounting of his private conduct particularly consequential for the institutional Church in Ireland. The 1992 revelation that he had fathered a son and misappropriated church funds to conceal the relationship was damaging enough; the subsequent allegations of sexual abuse, including those made by his niece describing years of assault beginning in her childhood, belong to a different order of severity entirely. His case sits within the broader history of clerical abuse in Ireland, where public standing and institutional protection repeatedly enabled harm to persist across decades.

Over a ten-week period in late 2006, five women were killed in and around Ipswich in what became one of the most significant serial murder investigations in modern British history. Wright targeted women working in street prostitution, and the speed and clustering of the deaths generated sustained national alarm before his arrest. The case drew sustained attention to the vulnerabilities of those on the margins of the sex trade, and Wright's conviction rested on extensive forensic evidence linking him to each victim.

His career traced a path through some of the most consequential institutions of the Nazi state — concentration camp administration followed by frontline SS command — placing him at the intersection of the regime's machinery of terror and its military apparatus. Lippert was also present at the Night of the Long Knives, where he participated in the execution of SA leader Ernst Röhm, an act that helped consolidate Hitler's grip on power.