The South African actor, who played fan favourite character Lord Ba’al, was kiteboarding at Topanga beach in Malibu, California, when the incident occurred.
Simon first debuted in Stargate SG-1’s fifth season in 2001, appearing in a total of 15 episodes as well as the 2008 film Stargate: Continuum.
Paying tribute to Simon was his wife Colette, who hailed him as “a true original” when announcing the news on Facebook.
He moved to the United States to pursue a career in acting and appeared in shows including 24, NCIS: New Orleans and The Americans.