His physical symptoms indicated an accidental overdose of heroin, cocaine, and prescription drugs. The report said Mr Jack's girlfriend had found him lying in bed unresponsive, with "multiple bottles of beer and champagne in the garbage can".
Mr Jack's death occurred shortly before he was due to demonstrate how heart implants could be hacked at the Black Hat security conference in Las Vegas.
This is an awful tragedy, but it seems hard to imagine that there was any foul play involved. They would've needed to subdue him and then make him ingest cocaine. Therefore they'd need to subdue him physically or chemically. Struggling for your life tends to show up on an autopsy, as does being subdued with chemicals.
It's not impossible, but the absence of evidence should lead us to accept the facts at face value.
RIP Barnaby Jack.