A body was found Tuesday around 11:30 a.m. on the beach in Garden City Beach, according to the Georgetown County Sheriff's Office.
The Coroners Office identified the man as Mark Teesdale, 46, of Surfside Beach.
Coroner Kenny Johnson said it appears Teesdale suffered a self-inflicted knife wound.
An autopsy is scheduled for Wednesday at Grand Strand Hospital.
The incident is under investigation.