His body was found on Tuesday at a home in Solana Beach, just north of San Diego, said San Diego County Sheriff's Department spokeswoman Jan Caldwell. The medical examiner's office said an autopsy showed Whitmarsh committed suicide with carbon monoxide from car exhaust.
Whitmarsh teamed with Mike Dodd to take the silver medal in the inaugural beach volleyball competition at the Atlanta Olympics. The team lost to Karch Kiraly and Kent Steffes in an all-U.S. final.
Whitmarsh was survived by his wife, Cindy, and two daughters.