Police were called at around 11.45pm on Saturday, 26 June, to reports of a man stabbed inside an industrial unit in Stockholm Road, SE16.
An unlicensed music event had been taking place at the location.
Officers attended along with London Ambulance Service. They found 26-year-old Jason with stab wounds and despite the efforts of emergency services, he was pronounced dead at the scene.
His family are being supported by specialist officers.
A 16-year-old male was arrested in the early hours of Sunday morning in connection with the incident. On the evening of Tuesday, 29 June, he was charged with Jason’s murder.
He will appear in custody at Wimbledon Magistrates’ Court on Wednesday, 30 June.
Detectives continue to appeal for anyone who was at the event where Jason was attacked to come forward. They are particularly appealing for anyone who filmed videos or took photos to share them using the dedicated online form.
Anyone with other information should call 101, providing the reference 8848/26JUN, or the incident room on 020 8721 4205, providing the reference Operation Tula.
Information can also be provided to the independent charity Crimestoppers, anonymously, by calling 0800 555 111.