The Oscar winner was in the studio doing voice-over for the indie film Absolutely Anything. The recording session came just weeks before Williams entered rehab. In the movie, Robin voiced the character of a dog.
"It was a magical experience working with Robin," said screenwriter Gavin Scott. "He bounced into the studio and he was like, 'Yes, let's do this!'"
In Tuesday's press conference, authorities revealed that Williams' wife Susan spent the night in a different bedroom, which raised the question of whether they usually slept in separate rooms.