The 40’s gangster films have tons of great classics:
- pushing up daisies
- ventilated
- taking a trip to the bone yard
I personally like technical sounding language
Things you can stay instead of "k1lled", "murked" or "unalived":
involuntarily converted to room temperature
cancelled on a corporeal level
successfully transitioned into fertiliser
rendered permanently horizontal
sent to investigate the potential existence of an afterlife