Published: Oct 19, 2010 3:35 PM EDT
Updated: Oct 19, 2010 12:35 PM EDT

FORT LAUDERDALE, Fla. (AP) - A kayaker who suffered a medical crisis at sea has died in South Florida.

Authorities said the victim, who has not been identified, and a friend were kayaking near Fort Lauderdale Monday when the man turned around and saw his friend's overturned kayak. Fort Lauderdale Fire Rescue officials said the man may have had a heart attack.

The friend placed a floating jacket on the victim and paddled back to shore in a nearly hourlong rescue.

The victim died at the hospital later Monday.