Standup comedian Don Rickles, who was best known as an insult comic, has passed away from kidney failure at the age of 90. For over half a century, the king of insult comedy headlined casinos and nightclubs from Las Vegas to Atlantic City. N.J. and appeared often on late-night TV talk shows. His fellow Hollywood stars paid tribute to the late comedian. Tom Hanks tweeted, "A God died today. Don Rickles, we did not want to ever lose you. Never. Hanx." Bob Saget tweeted, "My friend, my dad, the funniest biggest hearted of them all. A beautiful husband and father. My heart is broken. Rest In Peace. Don Rickles." Television host Jimmy Kimmel tweeted, "90 years with Don Rickles weren't enough. One of the sweetest and most lovely people I had the pleasure of knowing. We miss you already." Actor Mark Wahlberg tweeted, " #DonRickles was an absolute legend, my favorite comedian, and also my friend. Rest in peace." Filmmaker Mel Brooks tweeted, "Don Rickles. One of the bravest, funniest, and sweetest guys that ever performed. A dear pal that we will all sorely miss."