...a celebrated computer hacker who forced bank ATMs to spit out cash and sparked safety improvements in medical devices, died in San Francisco, a week before he was due to make a high-profile presentation at a hacking conference. The New Zealand-born Jack, 35, was found dead on Thursday evening by "a loved one" at an apartment in San Francisco's Nob Hill neighborhood, according to a police spokesman. He would not say what caused Jack's death but said police had ruled out foul play. The San Francisco Medical Examiner's Office said it was conducting an autopsy, although it could be a month before the cause of death is determined.
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. ... 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.
Much more at the link, but you get the general gist.