Iain Lawrence was a family man, a businessman, a success. But if you scratched beneath the surface, a darker picture emerged.

A look at the investigation into the attempted murders of Gary Mullins and Colin Meek during an armed robbery in 1994.

Colin Sutton and team make a horrific discovery when 43-year-old Eastenders actress Sian Blake and her two children are reported missing in 2015.

The killings of of James Attfield and Nahid Almanea in 2014 15-year-old Essex boy James Fairweather. Was the teenager's Ripper obsession to blame or was their more to his story?

Former detective Colin Sutton details how he and his team worked on the cold-case investigation of Catherine Corridan's disappearance alongside other high-profile cases.

Colin Sutton recounts his investigation into an attack against an elderly couple, who were stabbed in their home by a man they knew well.

After being picked up by NHS worker Duncan Bone at King's Cross in 1992, Karl Warne and Colin Lockett would murder their host at his flat.

An occult-obsessed man gets jail time after viciously stabbing his friend to death. Upon his release, he strikes again.

A reclusive millionaire, Allan Chappelow was brutally murdered by Chinese dissident and MI6 informant Wang Yam in an apparent identity theft scheme.

The story of Michael Danaher, who found himself deep in debt, prompting him to draw up a list of famous and wealthy robbery targets. But his plans resulted in vicious murder.

True-crime series following ex-detective Colin Sutton as he revisits the locations of important cases and reveals how they were solved.

True-crime series following ex-detective Colin Sutton as he revisits important cases and reveals how they were solved.

Former detective Colin Sutton revisits the investigation into the murder of Thomas Cressman.

Ex-detective Colin Sutton looks at the murder of Lee Harvey.

The Murders of Nisha Sheth, Brian Cherry and Richard Loudwell - The Peter Bryan Case: Ex-detective Colin Sutton revisits the locations of important cases.

Ex-detective Colin Sutton revisits the murder of 15-year-old Kyser Osman, who was stabbed by shockingly young offenders.

True-crime series following ex-detective Colin Sutton as he revisits important cases and reveals how they were solved.

Ex-detective Colin Sutton revisits the murder of Ronnie Cook, killed by his lover who was later dubbed 'the Black Widow'

Former detective Colin Sutton revisits the locations of various important cases and reveals how they were solved.

Colin Sutton returns to the case of the Chohan family, who vanished without a trace in 2003 before washing up one by one on the coast of the UK.

Former detective Colin Sutton revisits the locations of various important cases and reveals how they were solved.

The Murder of Sinead Healy: True-crime series follows former detective Colin Sutton as he revisits the locations of various important cases and reveals how they were.

When 31-year-old nurse Susan Annis was found dead whilst on a course at the Royal Brompton Hospital, police attributed her death to a heart condition. But three years later, a sexual assault in a hospital's emergency department led detectives to her killer.

With two men dead, and his mother seriously injured, a tangled web of friendship and murder all led back to one man: John Latus.

Sutton looks back at the murder of an 18-year-old and how the young killers who took turns to kick his head and body were caught