A FATHER "consumed by grief" killed the man he blamed for causing his son's drugs overdose death before taking his own life, an inquest has heard.
Roy Allison, 65, stabbed to death 34-year-old Duncan Bell three months after the sudden death of his martial arts fighter son, Roy Jnr.
Three separate inquests at Peterborough Coroner's Court heard how Roy Jnr, with his friends Mr Bell and Grant Maker, had been celebrating his 28th birthday at the home he shared with his father in Hetley, Orton Goldhay, Peterborough, England.
The trio consumed a mixture of MDMA, a pure form of ecstasy; cocaine; beer, and spirits during the course of the evening.
It was the next day, March 21 last year, that Roy Jnr was discovered lying alone and lifeless in his bedroom, while Mr Bell and Mr Maker suffered no ill effects.
The inquest heard a post-mortem examination found he had died from an ecstasy overdose.
In the months after his son's death, Mr Allison became so convinced that Mr Bell was responsible because the MDMA came from him, that he decided to kill him.
He was found dead at Mr Allison's address on July 1 last year.
He had been knocked unconscious and stabbed six times, the blow which killed him had pierced his heart, the inquest heard.
Next to his body was a large cardboard sign that read: "This drug dealer took my son, took our whole lives, I've just took his."
The body of Mr Allison was found just hours later hanging in the grounds of Peterborough Crematorium.
Giving evidence to the inquest, Mr Maker said the evening was under way when the group decided to get some more drugs.
"Then later that night Duncan said 'I'll get some MDMA', and we walked to his house to get it," he said.
Asked by Coroner David Heming if Roy Jnr was aware of what he was taking, Mr Maker said he was and answered: "We're all grown men coming up into our 30s, it was not like a kiddy, peer pressure thing."
Mr Maker said the three men had all consumed the same amount of drugs and alcohol and he had not noticed anything wrong with Roy Jnr before they left him in the early hours of the morning.
Detective Constable John Cox, who investigated the deaths, told the inquest: "It's possible that Duncan may have mentioned something that happened that evening that may have directed Roy Senior towards him as the culprit. He supplied the drugs that ultimately killed his son."
Mr Cox told the inquest Mr Allison also wrote a lengthy letter in which he set out his intention to kill Mr Bell, from Winyates, Orton Goldhay.
In it, he put such things as: "Like he did to my son I will do to him and take it all away from him." And of his son: "Wherever he goes, I go."
"So effectively he had formed the intention to murder him [Mr Bell], for want of a better phrase?" Mr Heming asked Mr Cox.
Recording a verdict of unlawful killing in respect of Mr Bell, the coroner told his mother, Diane,: "There's only one conclusion at the end of the day.
"We all know that it's a terrible tragedy, we know that Roy Snr had become consumed by grief, but the reality is that he had formed an intention and carried out a violent, brutal and vicious attack on your son."
After finding Mr Bell's body, police officers traced Mr Allison's phone signal close to the grounds of the crematorium.
The court heard how he mentioned suicide so many times in the months after Roy Jnr's death to family members that it had become almost a joke.
He had bought a double plot so he could be buried with his son and had both their names inscribed on a headstone.
Mr Heming said he was satisfied that Mr Allison had taken his own life and recorded a verdict of misadventure in respect of Roy Jnr.
Speaking outside court, Ms Bell said she was pleased the inquest was over and that it had shown her son was not a drug dealer.
"I'm glad the truth is out," she said. "Duncan was not a drug dealer, he had in the past had a drug problem."
Asked how she felt about Mr Allison, she said: "I forgive him. He's a man that had lost his son, his world had disappeared.
"He was psychotic; he was out of his mind.
"He wanted some kind of justice, he wanted a life for a life, it's just a shame that it was my boy and Grant was very lucky that he never got him."