Robin Williams has checked into a rehab facility to focus on his sobriety. His rep told People , "After working back-to-back projects, Robin is simply taking the opportunity to fine-tune and focus on his continued commitment, of which he remains extremely proud." Robin has been sober since 1982 after seeing his friend and fellow comic, John Belushi, die from an overdose of heroin and cocaine. "The Belushi tragedy was frightening," Robin said back in 1988. I knew I couldn't be a father and live that sort of life."