How to spawn an effect when an actor killed by a special weapon

[halrixx]

I have noticed some perfect effect sequences in CK. They are about death vfx. But how can I spawn them? For example, there is a ammo can cause acid damage, and there is an acid disolve vfx, I wanna actors killed by the ammo can disolve. But how can I know when they die, and how to attach vfx to them?