Care home bully turned killer Gary Allen is likely to spend the rest of his life behind bars.
But it took more than twenty years for him to face justice for the murder of Hull mum Samantha Class back in 1997.
So obviously a killer, he somehow managed to persuade a jury of his innocence and gain the freedom he needed to kill again, this time another mum Alena Grlakova in Rotherham.
After his conviction on Thursday for both murders, Hull Live can disclose how his childhood outbursts in Hull spiralled into violence with deadly consequences.
From attacking his own mum as she recovered from surgery to flying into a bizarre rage while watching the Eurovision Song Contest, Allen’s early life give a terrifying insight into his thirst for violence.
Allen’s upbringing in Hull displayed all the tell-tale signs of monster in the making.
A social services report published by the Hull Daily Mail in 2000 revealed Allen was first referred to a psychiatrist when he was just eight.
Young Allen would have temper tantrums, fire-raising tendencies and over-aggressive behaviour towards his younger brother and sister.
He went on to spend two residential periods at Baynard House in Hull between January 1982 and July 1983.
Six years later he attacked his own mother with a metal clothes prop while she was in bed recovering from surgery.
And when he was 14, he grabbed a girl by the throat and pushed her to the ground while hitting her around the head. A year later, he tried to strangle the 15-year-old son of his foster carer.
When he was 19, young soldier Allen was dealt with for attempted theft of an advertising flag and criminal damage while stationed in Germany.
His violent temper was highlighted when he threw a TV out of a window at the camp after the British entry at the Eurovision Song Contest failed to win.
When he was 21, Allen threatened a housemate with a large diver's knife.
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And just two years later, Allen told a friend his vehicle had been damaged and he had caught the man responsible and smashed his fingers.
Another two years later, he became involved with a group of men and hit one of them with a baseball bat.
Excuses of a killer
These were the early crimes of a man who would go on to kill at least twice.
Cold and calculating Allen had excuse after excuse after excuse as to why he couldn't have killed Samantha Class in 1997 and Alena Grlakova in 2018.
Samantha was found beaten, strangled and run over on the banks of the Humber Estuary in October 1997.
After his arrest on suspicion of drink driving linked him via DNA to her killing, Allen admitted having sex with Samantha - but he denied her murder.
Alena, described by Allen as a "casual acquaintance", was found in Rotherham in April 2019.
She was last seen on Boxing Day 2018. Allen was one of the last people to see her, but he said that she was alive when he last saw her.
He spoke of everything from autopsy reports of his victims and their supposed differences in them to a conspiracy against him by Humberside Police.
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Allen had become cocky and confident in his offending, which was to be his downfall.
He got away with too much for too long, he knew it and he thought it could happen again. But thankfully it will now be a long time before he is released.
Thirst for violence
Listening to evidence of Allen's behaviour after Samantha's murder and his acquittal for it is enough to send chills down the spine of anyone.
Getting away with her murder in 2000 seems to have spurred him on, seeking further victims to quench his thirst for violence.
A terrifying obsession with violently harming sex workers led Allen to offend again and again.
Allen was a defendant who cared more about his own reputation and the alleged "targeting" of him by the police than his victims and their families, some of who went through decades of pain and torture, with no one convicted.
His arrogance came across in spades, and his voice never shook as he spoke of the two women whose lives he savagely ripped away.
Allen pointed the finger at everyone but himself, blaming probation workers who he told his sordid and sickening fantasies to after he was convicted of harming two sex workers in Plymouth.
He had approached the two women for sex and, on each occasion, went with them to dark areas and attacked. The judge in that case said Allen had a "dangerous aversion to women".
During interviews with probation workers, Allen said he had the fantasies on a "weekly basis".
One probation worker told how he said he fantasised about restraining a prostitute and telling her, "I'm going to kill you and hurt you. No one is ever going to see you."
He said he also fantasised about repeatedly beating the victim with a bat and that he had similar fantasies for many years.
When he came across sex workers he said he would immediately develop a fantasy of "what he'd do to them".
Justice at last
His boasts would give police the crucial evidence they needed to finally secure a re-trial for Samantha Class’ murder.
When Allen returned to the Humberside area in 2010, Humberside Police launched an undercover operation - Operation Misty - to try and find the identity of Samantha's killer.
It was during this he made the chilling confession, which overturned his earlier acquittal.
In the audio recording taken by an undercover officer, Allen can be heard saying: "The truth of the matter is that I had sex with this prostitute one night and the condom split.
“She said 'I want your name and I want your address, your money and everything else, I'm going to tell the police you raped me’. So I strangled her, and I dumped her in the Humber.”
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His conviction – more than 20 years too late – means Allen is now off the streets and women everywhere are safer.
For Samantha Class' family, the man who took her away will finally be punished, and no one else will suffer at his hands.
Allen will be sentenced for the murders of Samantha and Alena at Sheffield Crown Court on Wednesday.