Police are hunting two men who gunned down a man on release from a 10-year jail term for firearms offences.
Eric Akinniranye was believed to have been on leave from prison
Eric Akinniranye, 25, was shot in Camberwell, south London, at about 1910 BST on Saturday after a dark Mercedes 4x4 rammed his motorcycle.
Detective Chief Inspector Peter Valentine said it had been a "deliberate shooting" and it was lucky no passers-by had been hurt.
Mr Akinniranye was an inmate at Coldingley jail in Woking, Surrey.
He is believed to have been on leave from the prison and was reportedly on a work placement.
The 25-year-old had tried to flee after the Mercedes deliberately shunted his motorbike.
But two men, believed to be wearing hoods, shot him repeatedly in the upper body.
Mr Valentine said: "The victim was deliberately targeted.
"I am fortunate that I am only dealing with one murder because of the indiscriminate shooting that occurred by these dangerous men on a very busy south London street. Any of the passers-by could have been hit."
The Mercedes ML270 was later recovered in nearby Peckham.
Forensic tests were being carried out on the car as a post-mortem examination was under way at Greenwich Mortuary.
A statement issued by the victims family said: "For someone to be allowed out of prison after such a short time signified that, yes, he made some mistakes, yet he learned from them and was turning his life around, which warranted his 28 days release to do community work and to re-unite with the family."