wiredmikey writes "A shocking and sad day today in the security industry. Well known hacker Barnaby Jack has passed away, sending a shock through the security community. Jack, a famed white hat hacker, was scheduled to present at the Black Hat conference on Tuesday, and present research on vulnerabilities in implantable medical devices. Shocked reactions hit the Twittersphere on Friday, as many in the industry conveyed their condolences, shock, and even disbelief, hoping new of the death was some sort of hoax. 'I just wake up and heard this, really sad, I can't believe this, no words,' Cesar Cerrudo, CTO, IOActive Labs, said in an email to SecurityWeek. Barnaby Jack is probably best known for his ATM hacking demonstrations, which he liked to refer as 'Jackpotting,' and performed at a few conferences, including a demonstration at Black Hat 2010 that got media attention around the world. The San Francisco Medical Examiner's office told Reuters that Jack had died in San Francisco on Thursday, but did not provide additional details."