CCTV footage of people who spilled out of a club when a man was shot dead on the dance floor is to be released six months after the murder.
Jean Ross urged people to help catch her son's killer
Daniel Ross, 22, was shot in the head at Scala nightclub in King's Cross, north London, last September.
His mother Jean urged those caught on camera to contact police to help track down her son's killer.
Up to 1,000 people, thought to have come from all over England, were in the club at the time of the shooting.
Mr Ross, a father-of-two from Kilburn, north-west London, was thought to have been on or near the dance floor on the middle floor of the club when he was shot.
The club's lights went on and between 850 and 1,000 people spilled out on to the street through fire exits before the police arrived.
Police said people in the club had come from all over England including Hertfordshire, Kent, Surrey, Suffolk, Lancashire and the Coventry/Birmingham area.
Police want to speak to clubbers caught on CCTV
Making an appeal Mrs Ross said: "I know people know who killed Daniel. The people with him know who killed Daniel.
"It has been very hard, Daniel was so much a part of our lives. He was always with us.
"He was lovely, he was a really good boy to us. He was my confidant, I could talk to him, he could talk to me."
Appealing for witnesses, Det Ch Insp Fiona Mallon said: "It's now almost six months since Daniel's death.
"Since then, Daniel's family not only have to live with their loss but also not knowing who killed their son or why.
"There were many people in the club that night and I need one of them to stand up and do what is right for Daniel, his family and the community of London."
Police are also offering a £20,000 reward for information about the murder.