Khan was jailed for life on Thursday

Paul Khan, a diagnosed paranoid schizophrenic from Cardiff, killed Brian Dodd as he walked his pet dogs, stabbing him 37 times on Ffrith Beach, in Prestatyn.

Sentencing Khan to life in jail on Thursday, Mr Justice Gibbs described the attack as the "ultimate horror".

On Friday Lord Alex Carlisle QC said Khan, who had been released from hospital, was clearly dangerous and an inquiry should be carried out.

"This is such a disturbing case. The case goes beyond the ordinary," he said.

If any of these so called expert committees ever think of letting this man or anyone like him out on the streets again they should seriously think of the consequences Enid Dodd

"A man who was plainly extremely dangerous carried out a wanton killing and this is something that needs to be investigated as thoroughly as can be."

He said it should be up to the judge to decide whether to take evidence in public or private but that the final report should be published.

His calls were backed by north Wales AM Janet Ryder.

The Plaid Cymru politician said that for the sake of Mr Dodd's family a review should be carried out quickly.

Mr Dodd's widow Enid, along with mental health charities have also called for an independent inquiry into why Khan had been released into the community.

Enid Dodd wants a judicial inquiry

"If any of these so called expert committees ever think of letting this man or anyone like him out on the streets again they should seriously think of the consequences," she said.

"If it wasn't for them my beautiful husband would still be alive today and I would not have to spend the rest of my life thinking of how Brian was savagely and brutally killed."

The Welsh Assembly Government has already launched a review into the case.

After handing out the 12-year sentence - which meant in theory that Khan could apply for parole after six years - Mr Justice Gibbs stressed that should not be misinterpreted by the public.

"In my judgement, the defendant presents an extreme danger to the public," he added.

"It is also my view that he will continue to present such a danger for a very long time.

"I am not a psychiatric expert and I cannot predict the future, but it is open to question in my judgement whether it will ever, at any rate in the foreseeable future, be safe to discharge the defendant."

Secure hospital

Earlier in October, Khan, 34, had pleaded guilty at Chester Crown Court to manslaughter on the grounds of diminished responsibility.

Mr Dodd, described as "a shy and gentle man", was attacked while walking his two Shitzhu dogs - he was repeatedly stabbed in the head and neck.

Khan's motive remained unclear as he told police he had no memory of the incident.

In court, it emerged that Khan was sentenced to an indefinite hospital order in 1996 after walking into a Cardiff library and slashing a man's throat.

He was treated at various secure hospitals and, in 2000, a mental health review tribunal ruled that he could be treated in the community.

The treatment appeared to work but in March this year Khan stopped taking his medication, and concealed his condition from staff.