Allan Grimson

Allan Michael Grimson (born 1958) is a British convicted rapist, murderer, and suspected serial killer who is responsible for murdering at least two Royal Navy sailors and who is suspected of killing many others, possibly up to another 20 undiscovered victims. The judge, who sentenced him to a minimum term of 22 years at his trial, said that Grimson was "a serial killer by nature if not by number". Because his two victims were killed on the same date exactly a year apart (12 December), detectives believe there may be more victims as yet unidentified. He is the prime suspect in the disappearance of Simon Parkes, another young Royal Navy sailor who also vanished on 12 December from Gibraltar while Grimson was docked in the area. In July 2026, Grimson was found guilty of a series of sex offences against men and boys in the 1990s.