Confront his aggressor and then forgive himself.
Zeller never talked about his problem because he was ashamed...very typical in sexual and/or physical abuse cases. Most, if not all, rape victims always talk about how dirty they feel physically immediately after the assault. They have this overwhelming need to cleanse themselves from the outside in. Problem is, unless and until they're able to really discuss the abuse in a meaningful way they never truly rid themselves of "the grime".
By not talking about their abuse, they mask it...try to hide (from) it. In "hiding," they think they can control their actions by running away from the pain and the memories, those flashbacks and nightmares that continue to haunt them. But they're only there because the victim doesn't talk about it due to their shame and guilt. And the fact that most never confront their attacker.
You have to talk about it; get those hurtful feelings out. Otherwise, they will consume you as they did William Zeller. You have to forgive yourself as well, recognizing you were a victim; you didn't ask for the abuse to happen. Someone took advantage of you for their own selfish pleasure.
Lastly, if you're able as the victim you should confront your attacker. Let it be known that they hurt you, robbed you of your dignity and YOU WANT IT BACK!
Those three things - not talking about the abuse, not forgiving himself and not confronting his attacker - all led to William Zeller taking his life.
So sad...it didn't have to be.
RIP, William Zeller. Hurt no more.