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The pair had been planning to kill an inmate for several weeks and had fantasised about eating their victim, the hearing was told.
She told the hearing: "My gut instinct was that he would carry out those threats, he said he had nothing to lose."
Mann was considered vulnerable due to being in debt to other prisoners over his drug use, while Parr claimed he wanted to become a woman and formed intense relation ships with other inmates.
Ms Duffy said Mann was 'manipulative' and was making up claims of suffering from anxiety and hearing voices to get medication to sell on.
Forensic psychiatrist professor Anthony Maden said although both killers had severe personality disorders and expressed violent fantasises, the attack would not have hap pened had they not met.
However, she treated his threats seriously and filled in the report which was sent to the prison's security department.
2011, he planned to kill 10 months before Harrison was attacked.
Mann strangled Harri son and stabbed him with a biro and then severed an artery with the home made scalpel, which ultimately caused his death, said police.
They ended up in cells next to each other and Mr Maden said: "There was an unfortunate meeting bet ween the two."
ensure the best information is given to the right people at the right time. It might not have made a difference here but it might on another occasion."
One officer told the coroner he wished he had known about Mann's claims so he could have kept a closer eye on him.
But once inside, Mann jumped Harrison and pushed him face down on the bed while Parr, 34, held his legs, the hearing at Crook in County Durham was told.
The hearing was told that Mann felt he he had 'nothing to lose' as he would not be eligible for parole for more than Burberry Handbag Ebay
For killing Harrison, both were given life sentences in July last year. Both are in solitary confinement and unlikely to be released.
Prison pair admit butchering Kendal man in cell in order to satisfy their cannibal fantasies From The Westmorland Gazette
He said: "I don't have the guts to kill myself but I do have the guts to kill someone else."
Mann's claims had been reported to the prison security department but were not disclosed to the officers on C wing where the two were housed, the hearing was told.
Robert Young, acting deputy governor at the Prada Cahier Wallet prison, said threats were an everyday occurrence, while prison officer James Winter said floor staff were only told a report had been made, not the details of it.
He said: "I suggest the prison service carry out a further review to Burberry Handbag Vintage
Mann was serving life after he killed two women while burgling a nursing home in Leicestershire while Parr was given life for attempted murder in 2003 after he tried to smother a patient at a hospital where he was being treated.
The nurse, Susan Duffy, said she filled in a Security Information Report after Mann said in January, Burberry Vintage Bag Ebay
Speaking at the end of the inquest, coroner Mr Tweddle said he had 'major concerns' over the way information about Mann had been shared prior to the attack.
He had written graphic descriptions in a diary discovered by prison staff and in a letter had said he planned to commit the 'goriest killings ever' to force a move to a seg regated wing of HMP Frankland.
The 11 strong inquest jury found that Harrison was unlawfully killed.
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