Try it.

I wrote this two days ago and it hasn't failed me yet. You have to place it on something you can kill though, like the actor you want to disappear.
Edit: Just tested it again to make sure I wasn't hallucinating. The enemy disappears 5 minutes after I've killed them.
Oh ok. I guess I am being stupid and missed something.

The way I see it, the second you set mode to 1, since its in a different if block as the timer, it should be true instantly, thus instantly deleting the body. But I am tired and probably looking at it all wrong.

(But I hope eventually I will see the error, as scripting is my strong point. T.T)