Donal MacIntyre: Unsolved

35 year old Claudia Lawrence returned home from her work as a chef at the University of York's Roger Kirk Center.

Grandmother Valerie Graves was brutally murdered five days after her 55th birthday. She was found dead in her bed by her sister on December 30th, 2013

Trevor Deely vanished from the streets of Dublin in the early hours of December 8th, 2000.

Penny Bell, a successful mother of two, left home at 9:40am. She drove into the Gurnell Leisure Centre car park less than an hour later.

August 24th, 1996, the severely battered body of 14-year-old Caroline Glachan was found by a drug addict in the Leven River near Loch Lomond.