A murderer left an armed robber with a broken nose after battering him with a pool cue behind bars.
Kirk McIntyre, 54, was caught on CCTV going into the cell belonging to Scott Fowler at HMP Shotts, Lanarkshire.
Minutes later Fowler was seen staggering from his cell with blood pouring from his face. A trail of blood led guards from Fowler's cell straight to McIntyre's.
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Fowler suffered a broken nose and cuts to his forehead, nose, the back of his head, and behind his ear.
McIntyre, jailed for a minimum of 20 years for the brutal slaying of Frederick McGettigan, denied all wrongdoing and went on trial at Hamilton Sheriff Court.
Fowler told jurors he had been hallucinating before he attacked McIntyre because he had taken illegal highs and was injured after falling and hitting his head on the concrete cell floor.
He claimed he had not been struck by a pool cue and that the pair had wrestled before he left.
But the jury took less than an hour to convict McIntyre of assault to severe injury in August 2020 following a two-day trial.
Sheriff Colin Dunipace ordered him to serve three years but told him it will run alongside his current term for murder.
Giving evidence to depute fiscal Rebecca Clark, Fowler said: "Kirk was trying to get me off of him, he had been in mine having a cup of tea.
"We were wrestling in the cell and I fell backwards, there must have been 200 kilos of weight falling to the ground between us. The floors in those cells are concrete."
Sheriff Dunipace said: "The jury found you guilty of a serious assault upon Scott Fowler and I have considered your record which is appalling.
"You have a number of previous convictions for assault and are currently serving a life sentence for murder so this can only be dealt with by a custodial sentence."
McIntyre brutally slit the throat of McGettigan, 51, over claims he had stolen a handbag he had handed to police.
McGettigan, known as Ricky, found the bag next to the Forth and Clyde but McIntyre later turned up at his Glasgow flat and killed him in August 2017.
A jury heard the dad-of-five wrongly believed his victim had taken the bag from the house of a relative.
Fowler was jailed for 10 years after charging into a man's home with a sawn-off shotgun in Fraserburgh in January 2018 before assaulting and robbing him.
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