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A double killer who boasted taking a life was 'better than sex' has been found guilty of a string of attacks against other young men.
Former Royal Navy petty officer Allan Grimson was jailed for life in 2001 for the murders of Nicholas Wright, 18, a naval rating from Leicester, and Sion Jenkins, 20, a barman from Newbury, who had also served in the Navy.
He had invited the two young men back to his flat and killed them both with a baseball bat when they rejected his sexual advances before dumping their bodies on two dates exactly a year apart in the 1990s.
He has now been found guilty of sexually assaulting three young men in the Navy and a teenage boy aged 14 - two of whom he had considered killing - around the same time of the murders.
Falklands veteran Grimson, now 66, targeted sailors he met as a teacher at the Royal Navy Firefighting School and lured them to his flat and sexually assaulted them in strikingly similar circumstances to how he killed Mr Jenkins and Mr Wright.
The court heard Allan Grimson, now 66, was jailed for life in 2001 for the murders of two sailors
Nicholas Wright, 18, and from Leicester, was killed by Grimson on December 12, 1997
Sion Jenkins, pictured, was 20 when he was killed by Grimson
Grimson has also been named as the prime suspect in the disappearance of Simon Parkes, an 18-year-old Royal Navy sailor who was last seen on December 12, 1986 in Gibraltar, where Grimson was stationed at the time.
He told police one of his alleged sex attack victims was 'lucky' to be alive because he would have killed him if his friend was not sleeping on the sofa.
He took the teenager to his flat in Portsmouth and sexually assaulted him – weeks before he murdered the Navy sailor in the same property.
Grimson told police in 1999: 'If you're going to rape somebody, to get away with it, kill it. And that's the only way you can do that.'
He told officers he looked for 'young males' in his class of Navy recruits who he could 'befriend' and 'dominate'.
He had denied the charges, claiming he was only standing trial as a 'tactic' to stop him from being freed on parole - after he was cleared to be moved to an open prison as a first step towards being released.
But he was found guilty on Monday following a trial at Winchester Crown Court - meaning he will stay behind bars.
Grimson, in a grey suit, showed no emotion as he was convicted of the rape and indecent assault of a teenage naval rating and multiple charges of indecent assault against three other males, including a 14-year-old boy, between February 1994 and November 1999.
He had met the complainants, apart from the 14-year-old, when they were young naval recruits taking part in a course at the Royal Navy Firefighting School on Horsea Island, Portsmouth, where he was an instructor.
He assaulted the victims in the same flat where he murdered his two other victims in Portsmouth, Hampshire.
The court heard he had also been with them at the Portsmouth nightclub, 'Joanna's' - which is also where he had been with his murder victims before taking them to his flat.
Grimson served in the Royal Navy and in 1999 he was a Petty Officer Marine Engineering Mechanic and an instructor at the Royal Navy Firefighting School in Horsea Island, Portsmouth.
The court heard his position 'brought him into contact with many young males aged in their late teens' over whom he 'exercised great authority, by reason of his status'.
John Price KC, prosecuting told the trial: 'In the period with which the trial will mainly be concerned, the late 1990s, he was a man in his late 30s.
'He had served with the Royal Navy since 1978. He was a big, powerful man and within the service admired as a capable instructor. He was a single man.'
Grimson told the police in 1999, after he was caught for the murders, that the young man was 'lucky' to escape without being murdered because his friend was also at Grimson's flat.
Mr Price told the court: 'Grimson spoke of other people he had thought of killing.
'He described how he selected those whom he wanted to get power over, a sense of achievement.'
Following the murders, Grimson was spoken to by police about the attacks on the four victims but was told no further action would be taken over them.
Six years ago, the Parole Board recommended Grimson be moved to an open prison as a first step towards being freed on licence.
His barrister, John Femi-Ola KC, said Grimson's chance of parole had been deliberately 'stymied' when police began reinvestigating his contacts with the four men and the Crown Prosecution Service gave the go-ahead for him to be charged.'
Psychiatrists said Grimson, nicknamed Frankenstein by Navy colleagues, was motivated by anger over his ugly appearance.
He admitted killing both of his victims after they rejected his sexual advances. He said of murdering Mr Wright: 'I just felt really good about it. I felt exhilarated.'
He said in an interview: 'It was such a feeling. It was a feeling of power, a good feeling. It was better than sex.'
Describing Mr Jenkins' murder, Grimson said he had felt a 'tingling' sensation to kill again 'since the first time'.
He had bludgeoned his victims with a baseball bat, then slit their throats to 'finish them off.'
Jailing him in 2001 Judge Peter Cresswell said Grimson was 'highly dangerous, a serial killer in nature if not by number.'
He described the two murders as 'horrifying and cruel.'
The discovery of the bodies in December 1999 sparked a worldwide hunt for up to 20 more victims.
Police visited every port Grimson had been to while serving on the aircraft carrier Illustrious and destroyer Edinburgh.
Although only ever charged with two murders, he has been named as the prime suspect in the disappearance of Simon Parkes, an 18-year-old Royal Navy sailor who was last seen on December 12, 1986 in Gibraltar, where Grimson was stationed at the time.
He has always denied involvement in Parkes's disappearance, but the family are '100 per cent certain' Grimson was responsible.
The case was closed last year.
Grimson will be sentenced on November 6.