The two men stole a number of highvalue watches from the shop in Kew Road, Richmond, on Saturday afternoon.
CCTV shows the member of staff being assaulted after initially being asked to mend a timepiece for them.
The victim, from Surrey, died hours later, although his death is "not being considered as homicide at this stage", the Metropolitan Police said.
The robbery is being investigated by the Met's Flying Squad, while the death is being probed by officers in the Surrey force.
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