The contract killer who murdered Salford's 'Mr Big' Paul Massey was 'shanked' by a member of a violent Merseyside gang in a 'vicious' prison attack.
Mark Fellows, nicknamed 'Iceman', 38, shot dead Mr Massey, 55, in 2015 with an Uzi sub-machine gun before murdering Massey's pal 'Scouse' John Kinsella, 53, as he walked his dogs three years later.
He was convicted of both murders earlier this year and was told by a judge he would spend the rest of his days behind bars.
Fellows, a member of a violent street gang, received a whole life sentence for both murders.
It was revealed in February that Fellows was badly hurt in a serious attack at Whitemoor Category A maximum security prison in Cambridgeshire.
The identity of the man responsible has now been revealed, the Liverpool Echo reports.

Fellows was slashed with a homemade weapon, called a shank by Kieran Blair - a member of a notorious gang that brought mayhem to the streets of south Liverpool and Knowsley.
Blair left the Salford crook with serious facial injuries following the attack at around 6pm on February 20.
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Fellows tried to fight back, but was overpowered.
Guards intervened as soon as possible and separated the men.
Blair tried to hide the home made weapon in his trousers, but guards found it.
He admitted charges of assault occasioning GBH and was handed an additional two years, to be served on top of his existing sentence.
Det Con Emily Clarke said: “This was a vicious, calculated attack on an unsuspecting victim.
“Blair caused a great deal of damage to the victim’s face, but thankfully the guards were on hand to prevent more serious injury.”
Blair was jailed for 14 years in 2016 for drug and firearms offences. Liverpool Crown court heard Blair was a member of a violent drug gang.

In one incident, the pillion passenger on a scrambler bike was seen with an Uzi machine gun moments before shots were fired at a house in Speke.
In a second matter shots were fired from one car at another during a terrifying car chase through Whiston.
A man who was found 'in a pool of blood' was left paralysed.
in June Fellows appeared via video-link at Manchester Crown court in a failed attempt to appeal against his whole life term.
He had a scar on his face and head during the hearing.
Paul Greaney QC, told the court that Fellows was a 'a contract killer prepared to kill for money.' He described the murder of Mr Massey as a 'a cold-blooded execution'.
The court dismissed the appeal due to the degree of planning that laid behind the murders of both Mr Massey and Mr Kinsella.
Earlier this year, Fellows claimed he shot Mr Kinsella because the Liverpool man was intent on revenge after his close friend Mr Massey was murdered.

Fellows shot Kinsella rather than 'waiting for him to find [him]', he claimed.
Massey's partner Louise Lydiate said that she did not believe Fellow's confession. She described Fellows as 'evil'.
A simmering feud within the Salford gang the A-Team sowed the seeds for the murders of Mr Massey and Mr Kinsella.
A volatile faction, dubbed the 'Antis', emerged.