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.

‘Misadventure’: The death of Mark Tremain in 2018

Police initially launched a murder investigation after a 52-year-old carpenter was punched to the ground outside his home in Lambeth, south London. The suspect was never charged and at an inquest five years later the coroner concluded the attacker acted in self defence.

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?