Britain's Darkest Taboos - Season 4

Chloe Gazzard discusses how her sister Hollie was stabbed to death by her ex-boyfriend at the salon where she worked in Gloucester.

The parents of Kelly Anne Bates look back on their 17-year-old daughter's relationship with her murderous boyfriend James Patterson Smith, which ended in the girl's death in 1996.

Sarbjit Kaur Athwal tells the story of how her mother-in-law plotted the murder of her young sister-in-law.

Elisa Frank talks about how her former lover Ahmad Otak murdered her sister and best friend in Wakefield, West Yorkshire

The recollections of three people who spent two decades in the care of foster mother Eunice Spry, who subjected them to all sorts of physical and mental torture.

Franky Fenton talks about how her paranoid schizophrenic son murdered his grandmother at her home in Leeds in May 2008.

Doctor Alison Hewitt discusses how her relationship with Al Amin Dhalla turned into a terrifying nightmare amid his web of lies and deceit.

A man reveals how his stepson's obsession with the TV series Dexter led him to kill his own mother in a brutal knife attack.

The case of Malcolm Webster, who killed his wife Claire in 1994, as told by his victim's brother and the murderer's second wife.

Gareth MacDonald's mother and father discuss how their son was brutally killed by his con-artist lover in September 2007.