You don't think putting a person in intense pain, putting a current through his muscles and nerves and artificially sending his stress hormones through the roof could have some dangerous side effects?
http://www.cbsnews.com/stories/2005/...in672709.shtml
TASERS are generally safe according to most reports but they do induce an incredible state of stress and pain. That has to increase the risk of death in some individuals.
I mean, what else are you suggesting killed him? Unless the officers broke his neck or something, the obvious culprit is damage caused by the TASER.