Season 6 (2015)

British criminal Robert Napper, who was convicted of two murders, one manslaughter, two rapes and two attempted rapes. Napper is a paranoid schizophrenic who has been diagnosed with Asperger's syndrome and. also believed to be the 'Green Chain Rapist' who carried out at least 70 attacks across south-east London over a four-year period ending in 1994.

Profiling rapists and serial killers John Duffy and David Mulcahy, who together attacked numerous women at railway stations in the south of England through the mid-1980s, killing three.

Chilling documentary series examining brutal serial killers. Despicable duo Gerald and Charlene Gallego joined forces to rape and murder several teenagers.

Spine-chilling documentary series examining brutal serial killers. This edition reviews the case of Levi Bellfield who murdered three women, including Milly Dowler.

Grisly documentary series examining brutal serial killers. Tony Costa murdered four women in 1969, before penning a chilling, unpublished novel detailing his crimes.

Shocking documentary series examining brutal killers. Ruthless Richard Cottingham murdered at least six people and dismembered his victims' bodies.

Chilling documentary series examining serial killers. This edition explores the case of ex-marine Cleophus Prince Jr., who raped and murdered six women in 1990.

Grisly documentary series examining serial killers. This edition examines the chilling case of Sean Gillis who stalked, raped and brutally murdered eight women.

The horrific case of Timothy Wilson-Spencer, who strangled five people in the 1980s. The case was historic as it was the first case solved with DNA evidence.

Grisly documentary series examining notorious serial killers. This edition explores the chilling case of killer cousins David Gore and Fred Waterfield.

Spine-chilling documentary series examining serial killers. After being convicted of attempted murder and kidnapping, David Carpenter went on to kill five women.

Grisly documentary series examining serial killers. This edition examines the chilling case of Bobby Joe Long who raped 50 people and murdered nine.