Conversation so far:
When did Steve die?
4 September 2006.
how did he die?
All of a sudden [the stingray] propped on its front and started stabbing wildly with its tail.
Where was he when the sting ray struck?
Irwin was on location at Batt Reef.
was he shooting a documentary at the time it happened?
taking part in the production of the documentary series Ocean's Deadliest.

Question: why did the sting ray strike him?
Self-contained rewrite: Why did the sting ray attack Steve Irwin?