Allan Michael Grimson (born 1958) is a convicted British 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, but 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. Despite fears of him having up to 22 victims, Grimson's release from prison is imminent and he is already being held in open prison conditions with day release provisions. Royal Navy Grimson joined the Royal Navy in 1978 and by the time of his conviction for murder, he was the rank of Petty Officer (PO). He had served aboard HMS Illustrious and was a trainer in fire fighting techniques whilst based at HMNB Portsmouth. Whilst being questioned by police, Grimson admitted that he scoured the ranks of trainees and cadets (that passed through HMS Excellent on the courses that he instructed on) so that he could dominate and kill the best looking ones. Victims His first known victim was 18-year-old Nicholas Wright who was in the Royal Navy. Grimson had met Wright on a fire-fighting course run by the Royal Navy in November 1997. Grimson offered to give Wright a lift home to Leicester on the weekends, but Wright and his family were suspicious of his motives. Whilst Wright was on shore leave from HMS Edinburgh in December 1997, he was seen out drinking with Grimson. They were witnessed leaving a Portsmouth nightclub together and according to Grimson, they went back to his flat where Grimson tried kissing Wright. Wright spurned his advances and Grimson attacked Wright firstly by punching him, then with a baseball bat (landing several blows) and then cutting his throat with a carving knife and dumping his body in the bath of Grimson's flat. Wright's body was later dumped beside the A272 road near Cheriton in Hampshire. Grimson was questioned by military police in 1997, but lied to keep himself out