Rachel Nickel was innocently walking her dog back in 1992 when she became the victim of a vicious sexual assault and stabbed 40 times.
In 1995, Stephen Cameron was stabbed in what the media described as a road rage attack.
Eleven-year-old Rhys Jones, from Liverpool, was shot dead in August 2007; a bullet fired by a gang member, intended for a rival, hit him on his way home.
Jill Dando, the BBC's golden girl, was murdered outside her home in 1999; the Metropolitan Police launched one of the largest investigations in its history to find her killer.
In June 1993, a killer stalked London's gay community; Colin Ireland had a morbid and perverse ambition to become a serial killer.
Two Six-year-olds and 3 adults were murdered. Police believed that the daughter had killed her family, but the spotlight turned to the one family member still alive—Jeremy Bamber
Sally Anne Bowman was just 18 years old when she was brutally raped and murdered after a night out with friends.
Raoul Moat went on a killing spree after his release from prison in 2010; he first shot his ex-partner and her boyfriend, then officer David Rathband before killing himself.
Reopening the crime files of some of the most shocking crimes in UK history to explore unanswered questions and reveal the clues that ultimately cracked the case; along the way, eyewitnesses, survivors, and detectives share their stories.