Robin Williams’ final post on social media was heartwarming message

MARIN COUNTY, Calif -- Robin Williams left his final message on social media two weeks ago.

A "Throwback Thursday" on Instagram, Williams posted a photo of his daughter, Zelda Rae Williams.

#tbt and Happy Birthday to Ms. Zelda Rae Williams! Quarter of a century old today but always my baby girl. Happy Birthday @zeldawilliams Love you!

Williams was found dead in his California home Monday.