Heart attack

Fun fact, Chris Nefcy, a software and electrical engineer, also did data analysis on EKGs and wrote the programming for the first AED.

He had his life saved by one.
http://m.seattlepi.com/lifestyle/health/article/Life-he-saved-did-indeed-turn-out-to-be-his-own-1240151.php

In my town we have one inside the church..