Operating within a single year around Istanbul, Aksoy killed five people and disposed of their remains in a manner calculated to delay discovery — a methodical approach that earned him a nickname still attached to his case. The swiftness of the killing spree and the logistics involved in concealing the victims placed him among the more organized offenders in Turkish criminal history.

The ten days Jenkins spent killing in Omaha came just weeks after his release from a decade-long prison term, a timeline that later drew scrutiny to the systems that had supervised and ultimately freed him. He had spent much of his incarceration in solitary confinement and had made documented appeals for psychiatric treatment that went unaddressed. Four people were killed before his arrest, and the case became as much an examination of institutional failure as of the man himself.

Blair's case documents a cycle of violence that spanned decades, beginning with a 1982 murder conviction for which he served only 21 years before resuming his crimes almost immediately upon release. His victims in the 2003–2004 series were women from Kansas City, Missouri, and investigators believed the confirmed count of seven did not represent the full scope of the killings. What distinguished Blair's case was the self-reported nature of his later crimes — he contacted 911 dispatchers directly to claim responsibility and direct police to victims' remains, a behavior that shaped the investigation considerably.

A peripheral but consequential figure in the final chapter of the James Gang, Liddil's decision to surrender and turn informant in early 1882 set in motion the events that ended Jesse James's life. His willingness to testify against Frank James — even if ultimately unsuccessful — marked him as one of the few gang members to exit the outlaw life through cooperation rather than death or imprisonment. The arc from horse thief to gang member to state's witness, and finally to respected horseman, makes him an unusual case study in how careers of frontier criminality could quietly dissolve.

A senior figure in the 'Ndrangheta's Zagari-Fazzalari clan, he spent two decades as one of Italy's most wanted fugitives while serving a life sentence in absentia for his role in a feud that left 32 dead in Taurianova. The clan's grip on local land transactions illustrates how 'Ndrangheta power operates through economic control as much as violence. His twenty-year evasion of capture — aided by purpose-built underground bunkers — reflected both the resources at his disposal and the difficulty Italian authorities faced in penetrating Calabrian organized crime.

Finland's most extensively press-covered criminal of the nineteenth century, Haapoja drew sustained public attention precisely because the full scope of his killings could never be firmly established — a gap between documented and suspected victims that left the record permanently unsettled. That uncertainty, as much as any confirmed act, defined his place in Finnish criminal history.

The leader of one of the Yamaguchi-gumi's most powerful affiliate groups, he built a reputation for violence and influence that extended well beyond Japan's borders. What drew particular scrutiny was his arrangement with the FBI: access to a life-saving liver transplant in exchange for information on yakuza operations in the United States, a deal that raised serious questions about the relationship between law enforcement and organized crime. His claimed retirement in 2008 did little to resolve those questions, as U.S. Treasury designations years later suggested continued involvement in criminal networks.

His case sits at a particular moment in Swedish legal history, when capital punishment was still on the books but increasingly subject to commutation — making his pardon as notable as the crime itself. Convicted of murdering Hanna Pålsdotter, Pålsson escaped execution and lived out his days under a life sentence, dying in 1914 at the age of eighty-five.