|Danny Pearce was killed for his Rolex watch, say police|
Detectives are hunting two suspects after what they described as a "horrendous" attack on Danny Pearce when he refused to hand over his property.
The pair are understood to have used a moped before carrying out the assault on the 31-year-old victim in Greenwich on 15 July.
The killing has been connected to two other robberies - one in Greenwich on 11 July and another in Southwark on 13 July.
Mr Pearce had been on a night out with his girlfriend at the time the attack took place in King William Walk, to the north of Greenwich Park.
He was walking home from Oliver's Jazz Club when he was confronted at 12.15am.
|Two of the suspects in Danny Pearce's killing are caught on footage from a CCTV camera|
He refused but was then chased by one of the men who stabbed him with a large knife before he was then shot at by the second suspect with a handgun.
The attackers only stopped when the victim's girlfriend shouted at them that she would give them the watch if they ceased.
CCTV footage filmed moments before showed the men - dressed in dark clothing and wearing helmets - at a Texaco petrol station in Creek Road, near Deptford, about half a mile away.
The men are said to have escaped in the direction of Nevada Street, close to the northwest corner of Greenwich Park.
|A CCTV image of one of the two suspects wanted over Mr Pearce's death|
"Without a hint of remorse they then took the watch and fled the scene."
Mr Pearce, from Bromley, was pronounced dead at the scene by paramedics.
In the linked attacks, individuals were targeted for their watches and threatened with weapons which were not used.
The ONS' report on national crime figures released last week , which showed a rise in recorded robbery, said an increase in moped thefts "could be a contributing factor in the rise in... robbery".