The case of Anders Behring Breivik, who claimed he was compelled to murder 77 people and injure a further 241 on a pre-planned killing spree in downtown Oslo and Utoya Island in July 2011.

American killer Anthony Sowell, who murdered 11 people between May 2007 and September 2009, during which time he was dubbed the Cleveland Strangler.

The murders of three women with a crossbow. Stephen Griffiths paraded the weapon he had used to kill Bradford sex workers Susan Rushworth, Shelley Armitage and Suzanne Blamires during 2009 and 2010.

The crimes of Surender Koli, who killed numerous people before eating his victims' body parts. Featuring an exclusive interview with the psychologist who spent hours assessing the so-called Slumdog Cannibal.

The case of Mark Erin Rust, who became obsessed with murdering women and keeping a trophy after each kill. With expert analysis from Dr Linda Papadopolous.

The case of Israel Keyes, who admitted to being a rapist, arsonist, burglar, bank robber and serial killer. Keyes saw the United States as a hunting ground for killing and other criminal activities, often planning his murders years in advance, burying murder kits underground to aid in his killings. He committed suicide while awaiting trial for the murder of Samantha Koenig.

French serial killer Michel Fourniret, who confessed to kidnapping, raping and murdering nine girls over a span of 14 years from the 1980s to the 2000s. His wife, Monique Olivier, exposed him after hearing the news of another child murderer's wife being convicted.

Explore what drove female UK serial killer Joanna Dennehy to take the lives of three men, who may have done nothing more than look at her in the wrong manner.

The crimes of Angus Robertson Sinclair, who raped and murdered Helen Scott and Christine Eadie and dumped their bodies six miles apart in East Lothian in October 1977. He became the first person in Scotland to be retried for the same crime after an acquittal, following a change in the double jeopardy law. He is suspected of murdering up to six other women.

The case of Eddie Leonski, a US soldier based in Australia compelled to strangle numerous women when he became obsessed with the idea of `stealing' their voices.