http://today.msnbc.msn.com/id/28871606/?GT1=43001
It was just a normal run of the mill heart attack. The difference here is that when they pronounced him dead, they didn't detect a faint pulse(they later used ultrasound to confirm after a nurse noticed it).

Things like this aren't unheard of, merely forgotten. There are actually documented cases of people coming back DAYS after being pronounced dead, or even sitting up at their funeral...granted, these were back before the days of autopsies and embalming, and much less sophisticated methods of detecting life...but it happened. Much more common are corpses sitting up or beginning to "breath", which is actually cause by ligaments tightening and gasses exchanging place...as a matter of fact, here's a funny comment found while researching: Morbid perhaps, but funny...
http://www.boingboing.net/2008/04/03/burglar-played-dead.html
" #12 posted by Takuan , April 4, 2008 3:54 PM

oh hello there! It's a chestnut but a good one; whenever the crematory has new staff (or suitable victim visitors), they are invited over the furnace and shown the mica peephole (or modern equivalent viewport). The set up is that they are told that the flame level has to be monitored. What they are not told is that the heat will draw the ligaments tight and make the corpse appear to try to sit up. Much hilarity ensues at the critical moment of course.

This is one of the reasons why I wish to be either buried at sea or consumed at a banquet of friends."
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