ORANGE CITY, Fla. - Officials say a central Florida diver had plenty of air in his tank, but its air valve was only partially open when he drowned at Blue Spring State Park.
An autopsy determined Slack's death was an accidental drowning.
Diving partner Daniel Vansickle told investigators they and were in water about 80-feet deep when Slack had trouble breathing. Vansickle says he let Slack breathe from his regulator.
When Slack didn't return it, Vansickle took it from him, swam to the surface and yelled for help. He dove back down and found Slack in about 100 feet of water.