
Stephen Lawrence: On the 20th anniversary of his death, the family of Stephen Lawrence reflect on his tragic murder in 1993, as well as their lengthy fight for justice. (S4, ep 1)

A hard-hitting look at the murder of Rachel Nickell, who was sexually assaulted and murdered in front of her two-year-old son on Wimbledon Common in 1992. (S3, ep 6)

Colin Ireland: The ex-wife and former friends of Colin Ireland cast new light on the psyche of the Southend serial killer who terrorised the London gay scene in 1993. (S4, ep 6)

Colin Ireland: The ex-wife and former friends of Colin Ireland cast new light on the psyche of the Southend serial killer who terrorised the London gay scene in 1993. (S4, ep 6)

Stephen Lawrence: On the 20th anniversary of his death, the family of Stephen Lawrence reflect on his tragic murder in 1993, as well as their lengthy fight for justice. (S4, ep 1)

Witnesses and terrorism experts revisit May 2013, when soldier Lee Rigby was murdered by two religious extremists near his barracks in Woolwich. (S5, ep 2)

Witnesses and terrorism experts revisit May 2013, when soldier Lee Rigby was murdered by two religious extremists near his barracks in Woolwich. (S5, ep 2)

A look at Raoul Moat's shooting spree in Northumberland during the summer of 2010, the huge manhunt that followed and the aftermath of his attacks.

Caroline Roberts, one of the surviving victims of serial killers Rose and Fred West, is among those revisiting the couple's horrific 1970s murder spree (S5, ep 3)

A look at the case of estate agent Suzy Lamplugh, who showed a client round a house in Fulham in July 1986 and was never seen again. Dermot Murnaghan hosts. (S6, ep 6)

Caroline Roberts, one of the surviving victims of serial killers Rose and Fred West, is among those revisiting the couple's horrific 1970s murder spree (S5, ep 3)

Garry Newlove: The wife of Garry Newlove, who was beaten to death outside his home in Cheshire in 2007, looks back at the night of her husband's murder. (S4, ep 3)

A look back at the 1989 Marchioness disaster. Fifty-one people died when the pleasure boat collided with a dredger ship on the River Thames. (S5, ep 5)

A look back at the 1989 Marchioness disaster. Fifty-one people died when the pleasure boat collided with a dredger ship on the River Thames. (S5, ep 5)

Christopher Foster: The brother of millionaire Christopher Foster joins those trying to understand why he killed his wife and daughter in Shropshire in 2008. (S4, ep 5)

Witnesses and terrorism experts revisit May 2013, when soldier Lee Rigby was murdered by two religious extremists near his barracks in Woolwich. (S5, ep 2)

The father of Clare Wood discusses how her murder in Salford in 2009 gave birth to a new law allowing people to find out if their partners have an abusive past. (S5, ep 5)

The father of Clare Wood discusses how her murder in Salford in 2009 gave birth to a new law allowing people to find out if their partners have an abusive past. (S5, ep 5)

Colin Ireland: The ex-wife and former friends of Colin Ireland cast new light on the psyche of the Southend serial killer who terrorised the London gay scene in 1993. (S4, ep 6)

Caroline Roberts, one of the surviving victims of serial killers Rose and Fred West, is among those revisiting the couple's horrific 1970s murder spree (S5, ep 3)

Denise Fergus reflects on the murder of her son. Two-year-old James Bulger was tortured and killed by 10-year-olds Jon Venables and Robert Thompson in 1993. (S3, ep 4)

Denise Fergus reflects on the murder of her son. Two-year-old James Bulger was tortured and killed by 10-year-olds Jon Venables and Robert Thompson in 1993. (S3, ep 4)

Bludgeoned to death whilst walking down a country lane, the horrific murders of Lin and Megan Russell made worldwide news. Discover the events of that shocking day. (S1, ep 4)

Eye witnesses, family members and neighbours discuss the case of Mick and Mairead Philpott, who set fire to their Derby home, killing six of their children. (S5, ep 6)