Zak Williams lights up when sharing memories ... But Zak, 37, admits that in the years that followed Robin's death, he fell into a deep depression and began to self-medicate with alcohol.

Robin Williams died Monday night ... Here are a dozen of Williams' most inspirational quotes.

Robin Williams was a comedy and Hollywood iconHis ... But even so, in honor of his legacy, here are some of his best and most profound quotes. Robin knew how to touch the heart "There is still ...