The mum of a missing sailor feared to have fallen victim to the Frankenstein Killer says the fiend must never be freed.
Margaret Parkes suspects Allan Grimson knows what happened to her son Simon, who is presumed murdered.
Witnesses say Grimson was the last person to see Simon before he vanished 35 years ago.
Allan Grimson – dubbed the Frankenstein Killer – has been given a parole date after serving 21 years for the murders of two young men.
Evil Grimson was called a “serial killer in nature if not in number” by the judge at his double murder trial.
Margaret, 76, told the Sunday Mirror she suspects Grimson is “the only person who can put us out of our living hell”.
She added: “We implore him to do so.
“We don’t think that he stopped at just two murders. Serial killers have a thirst for blood.
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“We’d like to think the Parole Board will throw out his application to be released until they’re completely satisfied he’s no longer a threat.
“With so many suspicions hanging over Grimson I’m urging them to think very carefully about possibly releasing him.
“We don’t want other families to have to go through the heartbreak that we have had to endure all these years.”
The last sighting of Simon was in December 1986 in a bar with Grimson. But the killer denied involvement in the teenager’s disappearance.
Without a body and with only circumstantial evidence that Grimson was connected to Simon going missing, the Crown Prosecution Service refused to charge Grimson with his death.
Margaret said: “We hope the truth about Simon’s death will come out before we go to our graves.
“If he is a decent human being and has an ounce of compassion left in his body [Grimson] will do the right thing – but unfortunately I don’t think he’s that type of character.
“He’s had 22 years to think on the murders he committed and the judge at the time of the sentencing described him as a serial killer.”
She and husband David, 80, endured more heartbreak in 2000 when their eldest son Derek died of a brain aneurysm.
The couple, who live in Bristol, have been in Gibraltar planting a tree in memory of their son.
They were joined by Simon’s former shipmates, who travelled to the British Overseas Territory for a special ceremony.
Margaret added: “To know there’s a permanent memory of Simon is lovely.”
Hampshire Constabulary said it could not comment on suspects as “the priority is to protect the integrity of our investigation into the disappearance of Royal Navy Rating Simon Parkes”.
