Ben Affleck wrote on Facebook he was "heartbroken" over the news of his friend and former co-star's death Monday.
Matt Damon reacted to the news in a statement Tuesday. "Robin brought so much joy into my life and I will carry that joy with me forever. He was such a beautiful man, I was lucky to know him and I will never, ever forget him."
Minnie Driver also tweeted: "My Heart's broken. Robin was a beautiful, kind soul. Can't bear that he's gone."