Hacker Barnaby Jack dies a week before demoing ability to kill a man from 30 feet with pacemaker

Well-known hacker Barnaby Jack has died in San Francisco, a week before he was due to show off techniques for attacking implanted heart devices that he said could kill a man from 30 feet away.

According to the Black Hat website, Jack was to present Aug. 3-4 on "Hacking Humans." The San Francisco Medical Examiner's office said he died in the city on Thursday. It gave no details.

Jack, a security expert, became one of the most famous hackers on the planet after a 2010 demonstration in which he forced ATMs to spit out cash, dubbed "Jackpotting," Jack had served as IOActive's director of embedded device security.

Jack's genius was finding bugs in the tiny computers that are embedded in equipment such as medical devices and banking machines. He received standing ovations at hacking conventions for his creativity and showmanship.