The Dauphin County coroner is investigating the death of a man during Sunday morning's "Catfish Triathlon" in Harrisburg.
It happened at around 7:30 a.m. in the water off City Island.
The coroner's office said it's believed the man suffered a medical condition while he was in the water, but did not drown.
The man was taken to the hospital, where he was pronounced dead.
An autopsy is scheduled for Monday.