text: William Beggs (pictured) is known as the Limbs in the Loch killer for raping, murdering and dismembering Barry Wallace, 18, in 1999 . A convicted murderer who murdered and dismembered his teenage victim has had boiling hot water thrown over him in an apparent revenge attack in a Scottish prison. William Beggs, 54, known as the Limbs in the Loch murderer, was described by police at the time of his conviction in 2001 as a 'serial killer in the making'. Beggs is serving a life sentence in Saughton Prison, Edinburgh, for raping, murdering and dismembering Barry Wallace, 18, in Kilmarnock, Ayrshire, in 1999. The teenager's limbs and torso were found in Loch Lomond and his head was dumped in the sea off the Ayrshire coast. Beggs screamed in pain as boiling water was thrown over his face and hands in the cell attack, the Scottish Daily Record reported yesterday. The alleged attacker was due for release this year and has since been moved to Shotts Prison. He reportedly told friends he was taking revenge after Beggs attacked him soon after he arrived at the prison. It is understood Beggs was treated for burns in the prison's infirmary but did not need to attend hospital. The teenager's limbs and torso were found in Loch Lomond (pictured) and his head was dumped in the sea . Supermarket worker Mr Wallace vanished on December 5 1999, after a Christmas night out with colleagues in his home town of Kilmarnock. In 2001 a jury found Beggs took the teenager to his flat and subjected him to a serious sexual assault. Beggs is serving a life sentence for murdering and dismembering shop worker Barry Wallace (pictured) He then murdered him and cut up his body. Shortly after the crime, Beggs, originally from Northern Ireland, fled to the Netherlands. After lengthy extradition proceedings, he was ordered in January 2001 to be returned to Scotland to face trial. After the High Court jury delivered their majority verdict and found him guilty it was revealed Beggs was once cleared of a similar murder by appeal court judges on a technicality. Beggs was jailed in 1987 at Teeside Crown Court for murdering a barman he met in a gay nightclub by slashing his throat, only to have the conviction overturned by the Court of Appeal, the BBC reported at the time. The court also learned that at the same trial Beggs was convicted of two charges of wounding and sentenced to four months for each. He was also jailed for six years in 1991 for slashing the leg of a man who escaped by jumping through a glass window. Beggs has repeatedly tried and failed to have his conviction overturned at the Supreme Court.
target: Infamous Limbs in Loch killer William Beggs was attacked in prison .
  Serving life for murdering and dismembering Barry Wallace in 1999 .
  Scalded when fellow prisoner threw hot water on him in revenge attack .