Khan had been previously sentenced to an indefinite period in hospital

Paul Khan, a diagnosed paranoid schizophrenic from Cardiff, killed retired accountant Brian Dodd in March, stabbing him 37 times on Ffrith Beach, in Prestatyn.

At Mold Crown Court on Thursday, Mr Justice Gibbs described the attack as the "ultimate horror".

He said Khan should serve a minimum of 12 years in prison, and questioned if Khan should ever be released because of the danger that he presented to the public.

Mr Dodd's widow Enid is among those calling for an independent inquiry into why Khan had been released into the community.

Mrs Dodd said she was quite pleased with what the judge had said.

"I think he did the right thing. I think he was quite sympathetic to me," she said.

"But 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.

"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."

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.

Mr Dodd was described as 'a gentle and shy man'

"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."

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.

The court heard Khan believed he was under constant surveillance and that he thought organisations including M15 were conspiring against him.

Stopped medication

Earlier this month, the Welsh Assembly Government launched a review into the case.

In court, it had 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.

On Tuesday, 25 March, Khan took his father's Ford Mondeo - with his pet Rotweiller in the back - and drove to Prestatyn.

Between 1140 and 1145 GMT he was spotted entering the car park of Ffrith Beach Festival Gardens.

Just over 30 minutes later Mr Dodd's lifeless body was found in the same car park.

Days later, Khan was found asleep in the car in Newport, south Wales, where he was arrested.