A reward of up to £10,000 has been offered for information following the murder of Salim Coulter in Fulham.
Mr Coulter, a 24-year-old trainee engineer from White City, was shot in the head as he was getting into a car in Walham Grove on December 5 at around 9.30pm.
Police and paramedics found him sitting in the front passenger seat of a silver and black Renault Captur, near the junction with North End Road.
He was pronounced dead at the scene.
Mr Coulter had been eating in Jerky Chicken restaurant with a friend before he was shot.
Crimestoppers is offering a reward of up to £10,000 for information regarding the murder.
The charity said that whilst arrests have been made, crucial information, including the recovery of the weapon used in the murder, is still sought.
Roger Critchell, director of operations at the charity, said: “Salim had just got into a friend’s car when a man in dark clothing appeared from the shadows, opened the car door and fired one fatal shot.
"The victim sustained a fatal head injury and he was pronounced dead at the scene.
“We are offering a substantial reward for information that leads to the arrest and conviction of the person or people responsible and urge anyone with information to contact Crimestoppers anonymously.
"We don’t ask for any personal details, you won’t have to speak to the police, and you won’t have to go to court.
"Just tell us what you know, not who you are.”
Anyone with information is asked to contact Crimestoppers, which can be done anonymously, either by calling 0800 555 111 or through its Anonymous Online Form at www.crimestoppers-uk.org
The reward will only qualify if passed to the Crimestoppers' number or the online forum and not if passed directly to the police.
Police investigating the murder arrested two people.
Omar Hutson has been charged with his murder.
Hutson, unemployed and of no fixed address, was also charged on Saturday December 17 with the attempted murder of a 25-year-old man in Walham Grove on the same date and with possession of a firearm.
He was arrested on Friday December 16 in Wandsworth.
A second person arrested on the same day, a 27-year-old woman, has been released on bail until a date in January 2017, pending further enquiries.
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