Author of the best selling "Complete Book of Running," which started the jogging craze of the 1970s.

How he died: A heart attack....while jogging

Fixx was visiting Greensboro, Vermont when he walked out of his house and began jogging. He'd only gone a short distance when he had a massive coronary. His autopsy revealed that one of his coronary arteries was 99% clogged, another was 80% obstructed, and a third was 70% blocked....and that Fixx had had three other attacks in the weeks prior to his death.