Sunday, May 26, 2013
They were called to Ladbrokes in Aberconway Road, Morden, by the London Ambulance Service.
The man, who has not been formally identified, was pronounced dead at the scene.
A Metropolitan Police spokesman said he was apparently attacked by another male.
Anyone with information is asked to call the incident room at Sutton on 020 8721 4005.
Alternatively, they can phone Crimestoppers anonymously on 0800 555 111.