It's been reported in the last couple of hours of so that the Crocodile Hunter, aka Steve Irwin, has died aged 44. He was filming a documentary and a stingray barb went through his chest. The incident happened on Monday morning Australian time.
According to Injurywatch:
Stingrays do not normally attack aggressively, or even actively defend themselves and stingray deaths are rare. When threatened their primary reaction is to swim away. However, when they are attacked by predators or stepped on, the barbed stinger in their tail is mechanically whipped up, usually into the offending foot; it is also possible, although less likely, to be stung "accidentally" by brushing against the stinger.