In broad daylight on a busy Woolwich street on May 22, 2013, serving soldier Fusilier Lee Rigby is attacked and murdered by Islamic extremists Michael Adebolajo and Michael Adebowale.

Several bodies are discovered buried in the back garden of the home of Rose and Fred West in 1994, and it is soon revealed that most of their victims died following episodes of sadistic rape and torture.

In 2012, Mick and Mairead Philpott are charged with the murders of six children that died in a house fire.

In 1989, 51 lives are lost when the pleasure boat Marchioness collides with the dredger Bowbell and sinks.

In April 2007, a woman embarks on a relationship with a man she meets on a dating website. Unknown to her, he is a criminal with a history of violence against women.

A close look at the May 2017 Manchester Arena bombing that occurred after an Ariana Grande concert where 22 people were killed.

The tragic story of Ann Maguire, who was stabbed to death by a teenage pupil while teaching a Spanish lesson at Corpus Christi Catholic College in Leeds.

The harrowing story of EastEnders actress Gemma McCluskie, who is murdered by her older brother in the flat they share in East London.

In 2011, a series of mysterious deaths occur at the Stepping Hill Hospital in Stockport, Greater Manchester.

A closer look at the crimes of Steve Wright, who was dubbed The Suffolk Strangler after murdering five women sex workers in Ipswich in 2006.

A look at the gruesome crimes committed by the East London serial killer Stephen Port, who drugged and murdered four young gay men in London between 2014 and 2015.