Can I use these two interchangeably?

(No ill wishes, just learning English)

I can't wait for him to die.
I can't wait until he dies.

Question

Can I use these two interchangeably?

(No ill wishes, just learning English)

I can't wait for him to die.
I can't wait until he dies.

Answer

Yes. They have the same meaning. They also have two meanings:
1. I am looking forward to this death.
2. I need to do something and it is probably  better to do it after he dies, but I need to do it sooner than that.