death by misadventure

noun1

1. •
   (UK) An accidental death not caused by any violation of law or criminal negligence, but by a risk taken voluntarily.

   • 8 July 1969¶ Rolling Stones guitarist Brian Jones drowned while ‘drunk and drugged’: coroner records death by misadventure. Mick Jagger pays poetic tribute in London’s Hyde Park. — 2019