Yes, no.Can a ghost actually commit suicide?
If he did actually die, would he come back as a live person?
Ghosts, despite being dead, are still made of matter (ectoplasm). Though, the rope thing would not work. You would have to do something to break down the matter or just make it go poof. A really strong blast of ectoplasmic energy can seriously hurt, weaken or even end up killing a ghost, as it destroys the ectoplasm the ghost is made of. Kinda funny when you think about it. What you are made of can kill you.
This PSA was brought to you by a Danny Phantom fangirl.