Susan Lewis said her son accepted her decision to go to the police
The mother of a man who took part in the brutal killing of a teenager said she had to turn him in to the police.
Susan Lewis, 46, from Great Yarmouth in Norfolk, called detectives after Jimi-Lee Stewart, 25, confessed to helping kill 17-year-old Simon Everitt.
The victim was tied to a tree, forced to drink petrol then set on fire, in June 2008.
Ms Lewis said: "I was devastated that I had to call (the police) but there was no way that I wasn't going to."
Stewart, 25, Maria Chandler, 40, both of Great Yarmouth, Norfolk, and Jonathan Clarke, 20, from Telford in Shropshire were all found guilty of murder at Norwich Crown Court.
'Horror and disgust'
Ms Lewis, a mother-of-three, said: "He told me exactly what happened and it had to be reported.
"My Jimi couldn't fight his way of a paper bag so when he was talking about being involved in a murder, I couldn't believe it.
"It's totally awful. My reaction was shock, horror and disgust. I was just like, 'no, this isn't happening'."
When he was 13, Stewart's father died and Ms Lewis said this had a devastating effect on the boy.
She said: "He started going in (to prison) from the age of 15. It has got to be at least twice a year.
"I think they said in court once that he had 30 driving offences. But then, at the time, I thought at least he was safe there."
Ms Lewis said her son accepted she had to tell the police about his involvement in the killing.
She said he told her: "No problems, you've got nothing to be sorry for."