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A former Royal Navy petty officer who is already serving a life sentence for two murders has been jailed for an additional 22 years after being convicted of sexually assaulting three young naval recruits and a 14-year-old boy during the 1990s.
Allan Grimson was sentenced to life imprisonment at Winchester Crown Court in 2001 for murdering Nicholas Wright, a sailor, and Sion Jenkins, a barman.
Grimson, now 67, killed Mr Wright in 1997 and Mr Jenkins in 1998 after meeting both men in Portsmouth. According to the Crown Prosecution Service (CPS), both victims were sexually assaulted before they were murdered.
Following a trial in July this year, Grimson was found guilty of raping and indecently assaulting a teenage Royal Navy rating. He was also convicted of indecently assaulting three other male complainants in offences committed between February 1994 and November 1999.
In addition, the jury at Winchester Crown Court found him guilty of taking indecent photographs of the child victim.
During sentencing, Grimson, who smirked while waiting to hear his punishment, was given a further 22 years in prison for the 13 offences. Judge Paul Dugdale said he had no doubt that Grimson remained a dangerous individual.
"It won't surprise anyone to know I have made a finding of dangerousness," the judge said.
Explaining his decision, Judge Dugdale stated that Grimson continued to pose a significant risk of causing serious harm to members of the public.
He said his assessment was based on Grimson's previous murder convictions and the similarities between those killings and the latest sexual offences.
The judge added that he believed there was a psychological connection between Grimson's sexual assaults and his desire to inflict serious violence on others.
During the latest trial, prosecutor John Price KC told the jury that Grimson met most of his victims while they were young naval recruits attending a training course at the Royal Navy Firefighting School on Horsea Island in Portsmouth. At the time, Grimson was working there as an instructor.
One of the complainants was not part of the naval training programme, as he was just 14 years old when the abuse took place.
Mr Price also told the court that Grimson had described one of his victims as "lucky to be alive" because another person had been present in a separate room during the incident.
The prosecutor highlighted that the assault happened only a few weeks before Grimson murdered Sion Jenkins in the same flat, when the two men were alone together.
Grimson, who is from Portsmouth, was previously described as a "serial killer in nature if not by number" when he received his life sentence in 2001.
The former non-commissioned officer had pleaded guilty to murdering Nicholas Wright, an 18-year-old naval rating from Leicester, and Sion Jenkins, a 20-year-old man from Newbury, Berkshire.
Grimson had become eligible for parole from 2023 and had previously been moved to a category C prison. However, following the latest charges, he was transferred back to a category B prison.
One of the victims who was abused by Grimson in 1998 told the court that he feared he would face an increased risk of danger if Grimson were ever released from prison.
Another complainant, who was raped and subjected to five counts of indecent assault in 1999 when he was aged 16 or 17, described the lasting impact of the abuse as devastating.
He said the experience had left him struggling with anxiety, emotional distress, anger, sadness, confusion and feelings of guilt.
A third victim, who was indecently assaulted in 1994, told the court that he believed Grimson had drugged him before the attack.
Meanwhile, the victim who was a child at the time of the abuse requested that his personal statement not be read publicly in court.
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