25 January 2013 Last updated at 14:53 ET

Peter Lewis murder: William Jones guilty of stabbing

Peter Lewis, 68, a vulnerable man with learning difficulties, was stabbed in the stomach

A drug addict has been found guilty of murdering a disabled pensioner on the elder man's doorstep.

Peter Lewis, 68, a vulnerable man with learning difficulties, was stabbed in the stomach by William Jones, 32, in Roath, Cardiff, on 28 April last year.

An "enraged" Jones, carrying a knife, knocked on doors looking for his former girlfriend and her partner.

A jury at Cardiff Crown Court took under three hours to find Jones guilty and he will be sentenced on Monday.

Mr Lewis, who had one eye and had great difficulty moving without the aid of a carer and his walking stick, was confronted by Jones in Claude Road at 02:30 BST on 28 April 2012.

Jones, of Cardiff, fatally stabbed Mr Lewis in the stomach.

A tape recording of an emergency call Mr Lewis made in his dying moments was played to the jury.

"I have been stabbed and I can't get up, somebody attacked me," Mr Lewis was heard saying.

"I am on my own, I am on the floor. He knocked me over. A boy hurt me, I need bandaging up. I am bleeding terribly, can you hurry up."

Jones told Mr Lewis he was looking for his "on-off" girlfriend Katie West, suspecting she was with a new partner, Dean Tilmouth.

William Jones stabbed Peter Lewis as he looked for a former girlfriend

After stabbing Mr Lewis, Jones ran off and threw the knife away into a scrap metal van.

South Wales Police arrived to find Mr Lewis slumped in his hallway. He had suffered a single stab wound to the stomach but he was still conscious and was able to give police brief details.

Mr Lewis died later that morning at the University Hospital of Wales.

Jones had knocked on several doors that night in Roath as he searched for Miss West and Mr Tilmouth.

'Busy social life'

Mr Lewis lived a busy social life, volunteered at charity shops, was a committed Christian and was described in court as a "champion of people with learning difficulties".

Jones had denied murdering Mr Lewis and told the jury during his trial: "I rang the door bell - it might have been just one long continuous ring or more.

"The door opened and Peter came out shouting with a knife and said he was sick of people like me.

"A lot of what he was saying was about druggy people and being sick of people like me."

Jones said disabled Mr Lewis waved a kitchen knife at him and took a step towards him.

He said: "I thought, 'what have I done to this guy?' He wasn't lunging at me but he took a step.

"I grabbed the knife in his hand and thrust him into the door and he went down.

"I wasn't aware the knife had gone into his stomach."

The judge, Justice Griffith Williams, told Jones he would be passing a life sentence but needed to consider setting a minimum term.

'Remember him with a smile'

Paul Hewitt, of the Crown Prosecution Service, said Mr Lewis posed no threat to anyone, least of all Jones.

"His murder was an appalling attack, carried out by a killer who has taken no responsibility for his actions, instead seeking to suggest that he himself was the one being attacked," said Mr Hewitt.

"Thankfully, this trial has exposed his deceit."

Mr Lewis worked as a volunteer for Ategi, a charity for people with support needs, for more than five years.

The charity said in a statement: "Pete truly was an inspiration to all those around him, and even people who only met him briefly described him as 'unforgettable'.

"People remembered how much he cared for his family, and how much their love and support meant to him.

"Our thoughts at this time are with his family and friends who continue to miss him, but like us at Ategi, will always remember him with a smile."