Five husbands, multiple suspicious deaths, and decades without prosecution defined a case that drew attention less for any single act than for its prolonged pattern and the persistence of one family's pursuit of answers. Neumar was ultimately charged in connection with the 1986 death of her fourth husband, though she died before the case reached trial.

A committed operative within Narodnaya Volya, Frolenko spent years working at the operational edge of Russian revolutionary terrorism — organizing prison escapes, infiltrating a St. Petersburg cheese shop as a false proprietor, and preparing to detonate an explosion beneath the Tsar's cortege at near-certain cost to his own life. When Alexander II was finally killed in March 1881, Frolenko was arrested within weeks and sentenced to death, a sentence commuted to life imprisonment in the Peter and Paul and Shlisselburg fortresses. He survived to be released in 1905, outliving nearly all of his co-conspirators by decades, and died in 1938 having received a Soviet pension specifically designated for participants in the 1881 assassination.

Constanzo built a criminal organization in northern Mexico that fused narco-trafficking with ritual violence, using the latter as both a control mechanism over followers and, in his own framework, a source of supernatural protection. His cult was responsible for multiple murders whose victims were subjected to ritualized killing, and the 1989 discovery of remains at a ranch outside Matamoros brought international attention to the scale of what had been operating largely out of sight. The case remains a singular intersection of organized crime, coercive cult dynamics, and religiously motivated homicide in late twentieth-century Mexico.

Her position as a caregiver gave her sustained, unsupervised access to some of the most vulnerable patients in the Finnish healthcare system — the elderly, the dependent, those least able to resist or report harm. Over five years and across multiple institutions, she administered fatal doses of sedatives and opiates to at least five people before her arrest in 2009. The breadth of her movement between hospitals, care homes, and private residences suggests the crimes were not impulsive, and her psychiatric assessment noted psychopathic traits alongside a finding of full legal culpability.

A self-described religious nationalist who operated largely undetected for years, Teitel carried out a scattered but sustained campaign of violence targeting an unusually broad range of perceived ideological and religious enemies. His crimes ranged from killings to bombings and targeted harassment, directed against Palestinians, gay Israelis, leftists, and others he viewed as threats to his worldview. The breadth of his targeting and the duration over which he acted made his eventual arrest in 2009 a significant moment in Israeli discussions about domestic extremism.

Over four years in the early 2000s, Mirgorod carried out one of the more prolific strings of killings in recent Russian criminal history, strangling 33 people before going undetected for another six years. His eventual arrest came not through witness testimony or investigative breakthrough, but through the cold persistence of forensic evidence — a fingerprint match made a decade after his crimes began.

He rose from teenage enforcer to the founding patriarch of one of Japan's most enduring organized crime organizations, building the Inagawa-kai into a syndicate that outlasted him by decades. What distinguished his long career was not simply the scale of what he built, but the reputation he cultivated within the underworld itself — as a mediator and stabilizing force among competing criminal factions, a role that granted him unusual influence across the broader yakuza landscape.