Wow - this is really sad, and kind of creepy. I had never heard of this before. A 10-year-old boy went swimming, inhaled some water, and drowned several hours later at home in bed. I guess the body's reaction to the inhaled fluid is to send more fluids to the lungs, which causes drowning several hours later.
http://abclocal.go.com/wabc/story?secti ... id=6186983