A computer hacker who gained cult status across the internet after revealing how to hack cash machines has been found a week before he was due to demonstrate how to kill someone by hacking their pacemaker. The body of Barnaby Jack was found in San Francisco yesterday. The city's medical examiner's office would not give any further 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'.