True Crime Files

In 2002, British police used mobile phone data and CCTV in one of the UK's first forensic cases to solve the murder of 27-year-old pregnant Soumia Cullinane.

When Carol Jarvis vanished, doubts grew over her husband Harry's story - and sinister letters he sent his mistress did little to support his lies.

In 2003, Jane Longhurst vanished. Her body was found weeks later and police soon closed in on Graham Coutts, who Jane had planned to meet.

14-year-old David McVicker accepted a ride from William Bonin, the "Freeway Killer," who murdered at least 21 young men, dumping their bodies along LA's freeways.

In 2008, Detective Steve Smith reopened a 7-year-old Met case after a tip from Europe linked a second murder to a prime suspect. Could they finally bring him to justice?

Vincent Brothers, a vice-principal with a loving wife and three children, faced tragedy when an intruder with a .22-caliber pistol entered their home one Sunday and killed them before church.

On June 2, 2010, taxi driver Terry Kennedy was warned of a nearby shooting, then waved down by fellow cabbie Derrick Bird, who fired a shotgun at him and his passenger.

n 1971, US Marine Elijah Butler was murdered four days after marrying his fiancee, Geraldine. His killer remained unknown until a cold case unit reopened the investigation in 2011.

In April 2004, Melanie and Bill McGuire, married five years with two sons, planned to move to a new home. Instead, Bill was found shot, dismembered, and discarded in a suitcase.