Killable poison

I was just wondering if there was an easy way to be able to make poison damage kill a unit. I'm making a tower defence map, and it can be quite annoying when a poison tower leaves a unit with 1 hp. The trick would be to make the player that killed the unit get the bounty as well.

So far I've thought of using triggers and it starts off something like this:

Event:
Unit - A unit Decays
Condition
(Life of (Decaying unit)) Equal to 1.00

I'm not sure what to do after this, or is there an easier way?

Decay is when the unit's corpse starts decaying I think

Oh, well now I have no idea.

shadowstrike poison kills a unit, try using that.

Thanks, it works.