TV appeal in widower murder hunt

Police are desperate for a breakthrough in the case

Detectives searching for clues to the shooting of a retired Army officer are turning to the BBC's Crimewatch programme for more information.

Lieutenant Colonel Robert Workman, 83, was found dead on the doorstep of his home in Hertfordshire, on 8 January.

Police are still keen to identify a mystery caller who rang for an ambulance after the shooting.

Detectives - who will appeal for help on Tuesday's show - say the victim may have been mistaken for someone else.

Carer found body

The murder team had previously released a tape of an anonymous 999 call made in the early hours of 8 January.

But despite hundreds of calls from the public offering information, they have yet to have a significant breakthrough.

The widower, who was known as Riley, was killed by a single shot from a 12-bore shotgun in the doorway of his home at Furneux Pelham on the evening of 7 January, police believe.

His body was found by his carer the next morning.

The anonymous caller rang for an ambulance from a public phone kiosk in Braughing, about three miles from the murder scene.

Experts believe the caller was an elderly man who possibly lived locally.

One man has been arrested in connection with the shooting, but was released without charge after questioning.

Crimewatch will broadcast the appeal on BBC One, Tuesday 27 January, at 2100 GMT.