His body was found by passers-by in a deep crevice on private land. Early investigations suggested he fell head-first.
"An iPhone, a wallet and a driving licence in Michael Graydon's name were found in searches at the scene," the prosecutor's office said yesterday.
The body was also identified by a distinctive tattoo of flowers on a bicep.
Graydon, a former boxer who headed a boxing organisation near Bristol in southeast England, was visiting Monaco to attend a bout.
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CCTV footage showed him climbing a wall before falling into the crevice.
A post-mortem examination will be carried out to determine the cause of death, the prosecutor's office said.
Monaco authorities said Graydon's body would be handed over to his partner and parents who are in the principality as soon as possible.