Robin Williams is gone but not forgotten, especially to those closest to him. On Sunday, the late actor's son, Zak Williams, paid tribute to his dad by celebrating what would have been Robin's 73rd birthday. The Mrs.
Doubtfire star -- who is widely regarded as one of the greatest comedians of all time -- took his own life in August 2014 at the age of 63. "Dad, on what would be your 73rd birthday, I remember you for all the hope and joy you brought to the world. There's not a week that goes by without someone sharing with me how you helped them through a dark time or a rough patch," Zak, 41, penned in his X (formerly Twitter) tribute.
He continued, "I'm so grateful to be your son. Love you forever." Zak -- born Zachary Pym Williams -- is one of the Jumanji actor's three children from two of his marriages.
Zak hails from Robin's marriage to Valerie Velardi -- whom Robin was married to from 1978 to 1988 -- while Zelda and Cody Williams were both born during his 21-year marriage with Marsha Garces Williams. Just last year, Zelda -- who has gone on to pave an illustrious career in Hollywood for herself, directing February's Lisa Frankenstein starring Cole Sprouse and Kathryn Newton -- similarly memorialized her dad on his birthday, which fell at the beginning of the SAG-AFTRA strike . "Happy birthday to Poppo, who definitely would've been out there fighting the good fight for art and artists today and always," she wrote at the time, attaching a picture of her dad on a picket line .