A reward has been trebled for information about the death of a man outside a nightclub.
Adam Hird, 30, from Epping, was found collapsed at the No.65 bar on Albert Embankment in Vauxhall shortly after 3.20am on June 15.
Mr Hird was taken to hospital but died two days later.
Witnesses said a blonde woman, described as tall, slim, in her 20s and wearing shorts, was seen recording the events on a phone.
An initial reward of £1,000 was offered for footage of the incident, which has now been increased to £3,000.
Enquiries into the circumstances of the incident are ongoing and it is currently being treated as suspicious.
Police are still awaiting the result of a post-mortem examination which took place on June 19 at Greenwich Public Mortuary.
Four men, aged 21, 22, 28 and 50, were arrested on suspicion of grievous bodily harm and bailed until later this month.
Anyone who witnessed the incident can call the incident room on 020 8721 4054 or Crimestoppers anonymously on 0800 555 111.
Anyone with footage can also call 07935 059 693 or email firstname.lastname@example.org