Firstly, committing suicide because of getting bullied doesn't make any sense. There are many ways to put a stop to bullying, and committing suicide isn't and shouldn't be one of them.
Nonetheless, if it really is done, then the bully must be made to realize what a big thing he/she's done, attending counselling or that type of stuff. 'Cause if bullies were charged with murder if their victims commit suicide, everyone would be in jail, because no one would deny bullying one person or the other at least once in their life. Therefore, the situation would not arise at all if people stop bullying each other. Even if they do, the victim should take up necessary steps to put a stop to it, and not do something like committing suicide.
You want to know more about me? There you go ^^
That's you, by the way.