Robin Williams' son Zak pays tribute to late comedian on 9th anniversary of his death

Robin Williams attends the premiere of "Old Dogs" at the El Capitan Theatre in the Hollywood section of Los Angeles in 2009. File Photo by Jim Ruymen/UPI
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Aug. 13 (UPI) -- Zak Williams, the 40-year-old son of Robin Williams, marked the ninth anniversary of the late comedian's death with a touching Instagram message.

"Dad, on the 9th anniversary of your passing, I'm remembering you for your most excellent fashion choices. These days are always hard and I love remembering you for being so very, very YOU. Love you so much!" Williams captioned a photo of his father wearing a busy patterned pair of shorts and a T-shirt as he waved a racket at fans from a tennis court.

The elder Williams -- an Oscar-winner who had been privately suffering from depression, dementia and Parkinson's disease -- hanged himself at home on Aug. 11, 2014. He was 63.

He was a stand-up comedian also known for his performances in the classic films Popeye, Aladdin, Dead Poets Society, The Fisher King, Good Morning Vietnam, Mrs. Doubtfire, Jumanji, The Birdcage, Good Will Hunting and the Night at the Museum movies.

Robin Williams is seen on screen as Billy Crystal speaks during an In Memoriam tribute during the Primetime Emmy Awards at the Nokia Theatre in Los Angeles in 2014. File Photo by Pat Benic/UPI
Robin Williams is seen on screen as Billy Crystal speaks during an In Memoriam tribute during the Primetime Emmy Awards at the Nokia Theatre in Los Angeles in 2014. File Photo by Pat Benic/UPI