~onDeath trigger problem

I'm having a problem using the ~onDeath trigger. I used to be able to do this but I have forgotten.
This is what I have:

Skills:
- command{c="bc I am dead now"} ~onDeath

I have also tried:
- skill{s="deathevent"} ~onDeath

deathevent:
Cooldown: 1
Skills:
- command{c="bc I am dead now"}