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10 November 2014, 17:33 | Updated: 30 March 2016, 13:50
The mum of a man - believed to have murdered a 22 year old woman in Blackwood - says he was a paranoid schizophrenic and should have been in hospital.
Gwent Police is looking at whether 22 year old Cerys Yemm died in an act of cannabilism.
Sally Ann Williams says she'd been worried about her son in the run up to his death - and described him as "troubled".
She said: "He would see things that were not there, he would hear voices, say food was trying to poison him and he would hallucinate. He was aggressive to people he thought were a threat to him,''.
"He should have been in hospital. Every time he came out of prison, we'd go through the same process. He'd be placed in a hostel somewhere with very little supervision and no psychiatric help outside.''
She also tried to convince the 34 year old to see a doctor but he refused.
The Ministry of Justice has confirmed it'll look at how Williams was managed after his release from prison and a serious further offence review will be carried out.