Man Falls To Death From Helicopter Over Grand Canyon
News story:
PHOENIX -- A helicopter tour company said a man took off his seat belt, opened a door and intentionally fell to his death during a sightseeing flight over the Grand Canyon National Park Thursday....
The man fell about 4,000 feet.
...
Authorities say the cause of death won't be determined until the body is recovered from White's Butte.
I'm going to go out on a limb here and say that the cause of death was sudden impact. Now, he could have had a heart attack mid air, but I really think smacking the ground at terminal velocity did him in.