Tbh he may of had a reason for suicide considering he split with his wife in september, people take things in different ways and it can just get too much.
There's never a good reason for suicide, it's one of the most selfish acts a person can perform imo.
I can't wait to see the new Batman though. The Joker is definitely one of the best villains ever, and it really looks like Heath went all out to play him spot on.