Affleck thanks Williams for his friendship and his role in Goodwill Hunting, which won Affleck and Matt Damon the Academy Award for Best Writing and launched their film careers:

Heartbroken. Thanks chief—for your friendship and for what you gave the world. Robin had a ton of love in him. He personally did so much for so many people. He made Matt and my dreams come true.

What do you owe a guy who does that? Everything.

May you find peace my friend. #RobinWilliams