With their shared careers in comedy and three "Night at the Museum" films together, Robin Williams and Ben Stiller were clearly close.

As news of the beloved actor's death spread through Hollywood, Stiller took to Twitter to share his touching memories of Robin and condolences to the actor's family.

See more celebrity reactions to Robin's death here.

Stiller and Williams still have "Night at the Museum: Secret of the Tomb" due out in December, with Robin reprising his role as Teddy Roosevelt for the third time. A trailer for the film was just released last week.

Young "Mrs. Doubtfire" Stars Speak Out on Robin's Death

His films "Merry Friggin' Christmas" and "Absolutely Anything" will also get posthumous releases.

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