Andrew Iacovou, 55, was found dead at a branch of Ladbrokes in Aberconway Road, Morden, where he worked, at 10:30 BST on Saturday 25 May.
A post-mortem examination showed he died from blunt trauma to the head.
Shafique Ahmad Aarij has been charged with murder and will appear before Camberwell Green Magistrates' Court on Saturday.
A 21-year-old man has been charged with murdering a father of two at a betting shop in south London.