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Anders Behring Breivik is a Norwegian domestic terrorist responsible for the 2011 attacks in Oslo and on the island of Utøya, the deadliest act of violence in Norway since World War II. His coordinated attack involved a car bombing followed by a mass shooting, resulting in 77 deaths. Breivik was arrested on the day of the attacks and later convicted of terrorism and mass murder. He received the maximum sentence under Norwegian law, with provisions allowing for indefinite extension based on continued risk.

Andrei Chikatilo became one of the Soviet Union’s most infamous serial killers after murdering and mutilating dozens of women and children across Russia and Ukraine between 1978 and 1990. Nicknamed “The Butcher of Rostov” and “The Red Ripper,” Chikatilo terrorized the Soviet Union for over a decade while authorities struggled to identify the perpetrator amid political pressure, investigative failures and widespread public fear. His crimes shocked investigators because of their extreme brutality, sexual sadism and mutilation of victims. Chikatilo appeared outwardly quiet and socially awkward, allowing him to blend into ordinary Soviet society while secretly carrying out one of the deadliest serial murder sprees in modern history. His eventual arrest and confession exposed major flaws within the Soviet criminal justice system and transformed the case into one of the most notorious serial killer investigations ever conducted behind the Iron Curtain.

Andrew Phillip Cunanan carried out a five-victim murder spree across four states between April and July 1997 that culminated in the fatal shooting of Italian fashion designer Gianni Versace outside his Miami Beach home. Beginning with the murder of his former friend Jeffrey Trail in Minnesota, Cunanan killed architect David Madson, wealthy Chicago developer Lee Miglin and New Jersey cemetery caretaker William Reese before targeting Versace. The nationwide manhunt that followed became one of the largest in FBI history. Eight days after killing Versace, Cunanan died by suicide aboard a houseboat in Miami Beach as law enforcement closed in.

Angela Wagner was a central participant in the Wagner family conspiracy that resulted in the Pike County massacre, one of the deadliest family murder cases in Ohio history. Along with her husband George "Billy" Wagner III and sons George Wagner IV and Edward "Jake" Wagner, she helped plan the murders of eight members of the Rhoden family during a custody dispute involving Jake Wagner's daughter. Angela pleaded guilty in 2021 to multiple charges, including conspiracy and aggravated burglary, and agreed to testify against her family members in exchange for the dismissal of the aggravated murder charges. She was sentenced to 30 years in prison and will not be eligible for release until the early 2050s.

Angharad Williamson became one of the United Kingdom's most reviled child killers after murdering her two young sons, John Paul Bennett and Jake Bennett, alongside her partner, Jamie Barrow, in South Wales in 2020. The boys endured prolonged abuse before being killed inside their family home. Following a high-profile trial, Williamson and Barrow were convicted of murder and sentenced to life imprisonment, with the case prompting renewed calls for stronger child protection measures.

Anthony Todt became one of Florida’s most infamous family annihilators after murdering his wife, three children, and family dog inside their Celebration, Florida home in 2019. Prosecutors alleged Todt killed the family over several days before living alongside the decomposing bodies while attempting to avoid financial collapse, criminal exposure, and personal ruin. The case generated intense national media attention because Todt publicly presented himself as a successful physical therapist and family man before the murders were uncovered. Investigators later revealed mounting financial fraud allegations, insurance investigations, and severe personal pressures surrounding Todt before the killings. The horrifying circumstances inside the home, combined with Todt’s shifting explanations and bizarre courtroom behavior, made the case one of the most heavily discussed family annihilation murders in modern American true crime.

Arthur Frederick Goode III was an American serial killer and child molester who was convicted of murdering three boys in Florida during the 1970s and 1980s. His confirmed victims were 11-year-old Richard Belcher, 10-year-old Richard Hunsperger and 10-year-old David Oakes, all of whom were abducted, sexually assaulted and murdered. Goode was also investigated in connection with additional child disappearances and killings, but he was never convicted of those cases. He received death sentences for multiple murders and was executed in Florida's electric chair at Florida State Prison on April 5, 1987.

Arthur John Shawcross became one of America's most infamous serial killers after murdering 14 people in New York between 1972 and 1989. After serving a prison sentence for killing two children, Shawcross was released on parole and later went on to murder at least 12 women in the Rochester area. His crimes remained unsolved for several years before investigators linked him to the murders through surveillance, witness testimony, and forensic evidence. Shawcross was sentenced to 250 years in prison, where he remained until his death in 2008.