He was killed while filming some footage for a documentary.
Irwin was shooting a documentary on dangerous marine life, in shallow water at Bat Reef, about 32 nautical-miles offshore, at about 11am (AEST).
Footage of the attack shows Irwin swimming above a 2.5m stingray before it turns on him and sends a poisonous barb through his heart.
Irwin was pulled from the water by a cameraman and a crewman, put on an inflatable tender and taken to a support boat about 500m away.
A sad day, indeed.