"White Hat" Hacker found dead at 35

Jack was one of the world's most prominent "white hat" hackers - those who use their technical skills to find security holes before criminals can exploit them.
His genius was finding bugs in the tiny computers embedded in equipment, such as medical devices and cash machines. He often received standing ovations at conferences for his creativity and showmanship while his research forced equipment makers to fix bugs in their software.
Jack had planned to demonstrate his techniques to hack into pacemakers and implanted defibrillators at the Black Hat hackers convention in Las Vegas next Thursday. He told Reuters last week that he could kill a man from 30 feet away by attacking an implanted heart device.

http://news.yahoo.com/hacker-barnaby-jack-unexpectedly-dies-ahead-hacking-conference-131558623.html