How police solved the 1994 cold case murder of Marina Koppel

The killer of a 39-year-old masseuse became known to police soon after the murder – but was not caught until his DNA was matched to a single hair left on the victim’s ring at her flat in Baker Street, Marylebone, nearly 30 years later.

A random attack? The unsolved murder of Anthony Littler

A 45-year-old civil servant was beaten to death in an alleyway behind East Finchley tube station as he walked home from a night out in 1984. The killers have never been traced. Did they attack someone else there two days earlier? And who made the anonymous 999 call?

The unsolved murder of Sami Sidhom: ‘He did nothing wrong’

The 18-year-old student was walking home from watching a West Ham football match when he was chased and stabbed to death by at least three people. Was he unwittingly caught up in a gang dispute and targeted by mistake? His family are still waiting for answers and justice.

‘We fear he may have been murdered’: The disappearance of Lee Boxell in 1988

The parents of a missing 15-year-old boy from Sutton, south London, are appealing for help locating his remains so they can finally say goodbye to their son. Crimestoppers are offering a £20,000 reward for information.