A Shelton man who died last month while harvesting geoduck in Hood Canal drowned after suffering a heart attack. Mason County Coroner Wes Stockwell says 48-year-old Daniel Richard Kelley had been harvesting geoduck in 14 feet of water off Ayock Beach for Sunset Beach Oyster Company on March 18th. Coworkers pulled Kelley out of the water after realizing he was not responding to their signals. The coworkers began CPR and brought Kelley to shore where they were met by an ambulance which him to Mason General Hospital where he was pronounced dead. A news release from the Coroner says that Kelley drowned after suffering a cardiac event. The release also says an autopsy and toxicology testing revealed that Kelley had pre-existing conditions that may have led to the cardiac event. According to Stockwell, concerns were expressed about Kelley being affected by carbon monoxide. However, toxicology results confirmed that carbon monoxide was not a factor. The Mason County Sheriff and OSHA are also investigating the death.