On Thursday may 31st at 17:52 police were called after a report of two men fighting was made.
Officers and the London ambulance service arrived to find a man in his 50’s with facial injuries.
He was taken to hospital by London’s air ambulance and is still in critical condition.
An arrest was made at the scene of a 20 year old charged with grievous bodily harm.
He was released on bail and will return to a south London station in May
DC Ollie Cahill-Smith, who is leading the investigation, said: “Although an arrest has been made I am still keen to hear from witnesses or anyone who has any information about this incident. If you haven’t come forward already, I would urge you to get in touch.”
Anyone with information is asked to contact Brixton CID by calling 101 and quoting CAD 6616/31 May or tweet @MetCC.