Nobody will ever know what was deep within, because suicide victims seem to always leave either incomplete notes or the message in the notes are too general. When a person is hurting in their mind, the pain is too great to continue living. Nobody understands the pain they are in.
He was using heavy drugs, which perhaps contributed to him having enough courage to pull the trigger. In his life he had a wife, a child, tons of loving fans, but he was indeed all alone when he killed himself. His wife and friends found out he was dead days later. If they had been close, she would have found out immediately. That gives you an idea how much he was suffering. Because being alone when you need someone is the biggest cause of suicide. Most people do not commit suicide with someone present, they do it when they're alone, sad, devastated, and nobody is there for them.