Patrice Alègre raped and murdered women in Toulouse and Paris in the 1990s. His case spiralled into one of France's most notorious — and discredited — scandals.

Sean Vincent Gillis murdered eight women in Baton Rouge while a second serial killer terrorised the same city. A soft-spoken man hiding monstrous crimes.

Robert Ben Rhoades, a long-haul trucker, turned his cab into a mobile torture chamber, preying on women along America's highways for years. He was caught saving a victim.

Faryion Wardrip murdered five young women in 1980s Texas. After serving time for one killing, DNA from a discarded coffee cup finally linked him to the rest.

Robert Pickton preyed on vulnerable women from Vancouver's Downtown Eastside, many of them Indigenous. His case exposed devastating failures to protect them.

Dr. Marcel Petiot exploited the terror of Nazi-occupied Paris, murdering people who paid him to help them escape. He was convicted of 26 murders and guillotined.

Anatoly Onoprienko, 'The Terminator', murdered 52 people in Ukraine — often wiping out entire families in their homes. Inside one of Europe's deadliest sprees.

Andrei Chikatilo, the 'Rostov Ripper', murdered at least 52 women and children in the Soviet Union — and an innocent man was executed for one of his crimes.

Serhiy Tkach, a former police investigator, murdered at least 37 women and girls in Ukraine — and used his police skills to send innocent men to prison.

Moses Sithole, the 'ABC Killer', lured women with false job offers and murdered at least 38 in 1990s South Africa, earning a sentence of 2,410 years.

Pediatric nurse Genene Jones is suspected of killing dozens of infants in Texas. A cover-up nearly let her walk free — until prosecutors fought back.

Alexander Pichushkin, the 'Chessboard Killer', murdered dozens in a Moscow park, aiming to record a kill for every one of the 64 squares on a chessboard.