29 April 2012 Last updated at 09:43 ET

Police name Cardiff murder victim as 'vulnerable' pensioner Peter Lewis

Police at scene in Claude Road, Roath, Cardiff on Sunday

An elderly man with learning difficulties was fatally stabbed in the hallway of the flats where he lived in Cardiff, say detectives.

Peter Lewis suffered a stab wound to his stomach in the communal hallway of the terraced house in the Roath suburb.

Mr Lewis, 68, who died in hospital, was described as "a vulnerable adult with learning difficulties" by police leading the hunt for his killer.

Police called the murder "despicable" and said there was no apparent motive.

Mr Lewis, who had family in Cardiff and elsewhere, was described as well respected.

He lived in a ground floor flat in Claude Road in the Roath district. The street includes a number of houses with flats and bedsits and the area is popular with students.

Police, who held a media conference on Sunday, still want to speak to a man seen running along nearby Oakfield Street around the time Mr Lewis died, in the early hours of Saturday.

Divisional Commander for Cardiff, Ch Supt Alun Thomas, said: "Our thoughts are with Mr Lewis's family who have our full support during this terrible time.

"It is understandable that the people of Cardiff, and in particular Roath, will be shocked and worried that such a serious incident taken place.

"I wish to reassure them that everything is being done to arrest the person responsible."

Police said Mr Lewis was stabbed at around 02:40 BST on Saturday.

He was taken to the University Hospital of Wales in Cardiff where he later died.

A major incident room has been set up at Cardiff Central Police Station.

The investigation is being led by Det Supt Stuart McKenzie, who said a dedicated team of officers is working "around the clock" on the inquiry.

Det Supt Stuart McKenzie and Ch Supt Alun Thomas appealed for help from the public and outlined more details of the case

Supt McKenzie said: "Officers immediately attended the scene where they tended to Mr Lewis before he was taken to hospital by ambulance where he sadly died.

"I am anxious that the person responsible for his murder is apprehended and would urge anyone with information to contact the incident room or Crimestoppers anonymously."

Police want to trace a man seen in Oakfield Street at 02:45 BST.

He was wearing a light-coloured hooded top and trainers, and was running in the direction of Newport Road.

Detectives want to hear from the man, who was white, or anyone who may have seen him.

They are also appealing for information from anyone who saw or heard anything suspicious in Claude Road and Oakfield Street areas on Saturday morning between 01:00 and 03:00 BST.

South Wales Police have asked for witnesses or anyone with information is asked to contact the incident room at Cardiff Central Police Station on 02920 571530 or Crimestoppers anonymously on 0800 555 111.