Police have released CCTV footage of two murder suspects filling up at a petrol station minutes before they allegedly fatally shot and stabbed a father for his Rolex.

Detectives investigating the fatal stabbing of builder Danny Pearce, 31, issued new footage on Thursday showing two men in motorcycle helmets and tracksuits with a moped at the petrol station in Deptford, south London.

The CCTV footage was filmed at the Texaco Petrol Garage in Creek Road shortly after midnight on Saturday, July 15.

Just minutes later as Mr Pearce left a jazz bar in Greenwich with his girlfriend and some friends, two men riding a moped drove up towards him and demanded his watch, police said.

He refused to hand it over and one of the moped riders stabbed him repeatedly in the neck with a large kitchen knife.

The second suspect produced a handgun and began shooting towards Mr Pearce as he tried to run for his life.

Detective Inspector Jo Sidaway, who is leading the investigation, said: "The sight of this large weapon and sounds of gunshots terrified not only Danny's friends but also local residents and it is only by sheer luck that those with Danny did not suffer serious injury or worse as a result of the repeated shots fired.

"Danny sought help at a nearby address but was fatally attacked by the suspects who showed no mercy and only stopped their attack when the victim's girlfriend shouted out to them that she would give them the watch if they ceased their attack.

“Without a hint of remorse they then took the watch and fled the scene.”

The pair ripped the Rolex off the victim’s wrist during the attack in King William Walk in the early hours of Sunday. The suspects ran off in the direction of Nevada Street.

Police believe the suspects were also involved in two other robberies, one in Greenwich on July 11 and the other in Southwark on July 13.

DI Sidaway added: “On both of those occasions individuals were targeted for their wristwatch and threatened with weapons which were not used.

"It is vital that those involved are identified and brought to justice before anyone else is seriously harmed as they clearly do not hesitate to use deadly violence."

A post mortem gave Mr Pearce’s cause of death as multiple stab wounds.

No arrests have been made.

Anyone that can assist the investigation can contact the incident room on 020 8721 4005, or police via 101 or Twitter @MetCC or Crimestoppers on 0800 555 111 or visit crimestoppers-uk.org.