His ex-wife and children live in Sacramento.
Services will be at 10 a.m. at Capital Christian Center, followed by a memorial service.
Hashtag #RobinWilliams was trending on Twitter as fans and Hollywood miss the beloved actor and comedian.
A 36-year-old man died in the three-vehicle collision.
Youth sports coach Tom Wieser underwent aggressive and experimental therapy to fight his cancer, but died earlier this week.