Two teenagers have been jailed for life for shooting a 25-year-old in the head in a "deliberate execution".
Umar Tufail is thought to have been the victim of mistaken identity when he was attacked in South Norwood, south-east London, last July.
Kyrone Daley and Sanchez Thomas, both 19 and from West Norwood, south London, were found guilty of murder at the Old Bailey.
Thomas will serve a minimum term of 25 years and Daley, 22 years.
The court heard Thomas had been stabbed in the leg by a brother of the murder victim.
The 19-year-old then mistakenly shot Mr Tufail as he sat in a car.
Judge Stephen Kramer told the pair: "It seems that the motive for this shocking murder lies in the gang culture in south London in which guns are readily available.
"For a perceived slight for you, Sanchez Thomas, having been stabbed in the leg by the younger brother of the deceased, I am satisfied your motive was revenge.
"Both brothers looked similar. Whether by accident or design, you took your revenge on the brother who had not stabbed you."
The gunmen pulled up next to Mr Tufail's car and fired at almost point-blank range through an open window.
The 25-year-old died in hospital the following day.
William Boyce QC, prosecuting, told the trial: "This was a deliberate execution."