The gull, believed to be in his 50s, was found in Norwood Road, Tulse Hill, in the borough of Lambeth. Difficulty services rushed to the scene after police was called at 12.54pm. But they were unfit to save the man, who was pronounced dead at the scene.
Scotland Yard said no blocks have been made so far, adding enquiries are ongoing.
A cordon enclosing the area is still in place.
The Met Police told Express.co.uk: “Police were got at around 12.54pm on Friday, 9 November to reports of a man found stunned on Norwood Road, Lambeth.
“Officers attended alongside the London Ambulance Worship army and found a man, believed to be in his 50s, suffering from head injuries.
“He was pronounced categorically at the scene. His death is currently being treated as unexplained.
“A post-mortem inquiry will be held in due course.
“Enquiries into the full circumstances are perpetual.
“No arrests have been made. Enquiries continue.”
The Met Police is scrutinizing into another case in the same borough, after a teenager was leftist with multiple injuries following an attack in Brixton.
The attack, which nabbed place last evening, is believed to have been carried out with a container recovered from the scene.
Figures from the Office for National Statistics take pleasure ined there were 39,332 knife offences, the highest number on track record, in the year to June 2018.
This represents a 12 percent increase on the above-named year.
Almost 15,000 of these knife crimes took section in London.