A life prisoner slashed child killer Mark Bridger from temple to chin, severing an artery, to get him to reveal where April Jones's body was hidden, a court heard today.
Convicted murderer and rapist Juvinal Ferreira, 24, attacked Bridger with a knife fashioned out of a razor at the top security Wakefield Prison, West Yorkshire, in July.
He was sentenced to a second life sentence at Leeds Crown Court and had five years added to his minimum term, meaning he will not be released before 2036.
Ferreira and other life prisoners had talked about attacking Bridger to make him reveal the whereabouts of April's body, police were told.
Jonathan Sharp, prosecuting, said: "He said that Bridger's crime had been discussed, and he claimed people had suggested that if Bridger was attacked, rather than say befriended, Bridger would then be more likely to reveal where April Jones's body was."
The premeditated attack happened three days after Bridger was allowed to associate with other prisoners.
Ferreira fashioned a weapon out of a prison-issue razor with extra blades attached to the handle.
Mr Sharp said: "The defendant saw him and walked directly up to him with the blade held between thumb and forefinger.
"He then slashed him down the face, causing a deep wound extending from temple to chin.
"He paused for a moment and looked Bridger directly in the eyes, in Bridger's own words 'as if to admire his work or show me who it was'."
The child killer also suffered a cut to his arm as he tried to defend himself.
He required more than 30 stitches to the face wound, which required surgery under general anaesthetic. He will be scarred for life.
Mr Justice Coulson, who sentenced Ferreira over a videolink, said the motive for the attack was no mitigation.
"Convicted murderers cannot appoint themselves as unpaid investigators of another crime, no matter how serious. They plainly cannot do that by themselves committing violent crime to do so."
Robin Frieze, defending, said Ferreira did not attack Bridger to enhance his own status in prison, for reward or because he was incited to do it.
"He does not suggest he was put up to it, but he listened to talk within the prison and he was under the impression that if he put the complainant in a state of fear then it was more likely it would achieve closure for the family of his victim," Mr Frieze said.
"He appreciates that was a wholly misguided and wrong thing to do."
When the judge told Ferreira he was about to be sentenced, the life prisoner replied: "No problem."
He was at least 24, the court heard, but it was impossible to be more accurate as his date of birth was unknown to the authorities.
He arrived in the UK in 2007 with his mother and the following April he raped and murdered 47-year-old Elaine Walpole in Dereham, Norfolk, after befriending her.
He stabbed her through the neck and there were bite marks on her cheek and chin.
In 2009 was jailed for life with a minimum term of 22 years and was recommended for deportation after his sentence was served.
Mr Justice Coulson said his sentence for slashing Bridger had to be consecutive if it was to have any deterrent effect.
Life prisoners cannot go around attacking each other with "impunity", the judge said.
"You are a dangerous offender," he said. "Accordingly, the only proper sentence is a further sentence of life imprisonment."
Ferreira was due to be eligible for parole in 2031 for the offences against Ms Walpole, but that was increased by five years by the judge.
Bridger, a father of six, snatched April near her home in Machynlleth, Wales, on October 1 last year.
The five-year-old's body has never been found. Her funeral was held last week.
Bridger was given a whole-life tariff at Mold Crown Court in May.