[Excellence]

The Naval Petty officer had a pacemaker which was supposedly remotely accessed to re-program it to increase said officer’s heartbeat to 400bpm. That did not appear “natual” to Ducky.
Andrew Breitbart did not have a pacemaker.
Fear not, unless you have a pacemaker.

[Seizethecarp]

Didn't I read that the CIA had some kind of dissolving dart that could be fired into a person and induce a heart attack leaving no trace? A drone could deliver something like that...soon if not currently.