Police investigating the murder of a 90-year-old World War II veteran in south London are looking for a homeless man as a potential witness.
Geoffrey Bacon was attacked on the doorstep of his flat in Camberwell, south London, on 26 April.
He suffered a broken hip and died 11 weeks later in hospital.
The Metropolitan Police (Met) said the attack took place when the widower returned to his flat after visiting the shops.
Punched in face
As he entered his home, he was violently pushed to the floor by a man who punched him in the face and demanded money.
His attacker escaped with just £40 and his bus pass, police said.
The pensioner was a well-known and liked character in the area in which he had lived for 40 years and once worked as a driver for US General Dwight Eisenhower.
Detectives are now looking for a local homeless man who they hope can help with their inquiries.
"We're looking to identify and speak to this man," said the spokesman.
"However, at this stage he is deemed a witness and not a suspect."
Police are searching for a light-skinned black man, aged between 30 and 40.
A £20,000 reward is on offer for information that leads to a conviction.