This article is extremely personal to me, and I just want to let you all know that we all have our own problems, so don't be quick to judge anyone. Robin Lehner has helped me stay clean in my recovery so far, and is an ideal role model that shows with the right help and attitude you can beat anything.
The Athletic has an in-depth article on Lehner's problems. Mental illness and addiction were his two demons. He was diagnosed with Bipolar disorder, which I believe is one of the tougher mental illnesses to battle.