"We are awaiting information that will help explain how this tragic event occurred," he said."
This quote is from the story on Yahoo! Let me give you the short answer Mr. Geary - you did something stupid and something bad happened. Much more common than dying from drinking too much water.
Correction: SHE did something stupid. No one forced her to drink the water. By your logic, if your local radio station says "The first one to jump off the Golden Gate bridge gets an X-Box" would you do it?