Messages of remembrance poured in after the Democratic giant from Nevada died at 82 after a years-long battle with cancer.
Dwayne "The Rock" Johnson, Elijah Wood, Nathalie Emmanuel and Patricia Arquette led tributes to Halyna Hutchins.
The Oscar nominee, who appeared in "The Night Of" alongside Williams, praised his late co-star as a "rare talent" and "unique soul."
"We will miss him. But he will be here forever," Questlove wrote in an emotional statement about the iconic rapper.
“He ended up being sort of a bond for the whole family.” Former President Barack Obama reflected on how much their beloved dog Bo meant to them.
"I will miss my Grandpa, but I know he would want us to get on with the job," the Duke of Cambridge said Monday.
Bryant Johnson's strong-armed gesture was fitting, given that he coached the late Supreme Court justice for more than 20 years.
"Our hearts feel empty without our friend, but we find comfort knowing that he is free at last."
The musical giant, who had big hits including "Ain't No Sunshine" and "Lovely Day," died this week from heart complications, his family said.
The late rapper and community activist was fatally shot on March 31, 2019, outside of his Los Angeles store, Marathon Clothing.
"Honest, witty and kind. The world will be a little less funny without him now he had run down the curtain and joined the choir invisible."
"I grew up wanting to be only her," Shonda Rhimes said about the Pulitzer Prize-winning novelist on Twitter.
He "talked me down from countless ledges, talked me through eating disorders, helped me out of a dark relationship and through endless breakdowns," she said.
The broadcaster said he always avoided focusing on the anniversary of his dad's death -- until now.
The Instagram tribute features a photo with the couple's friends and their daughter Ariane.
They found a beautiful way to include their dad in the father-daughter dance.
The singer paid tribute to the late rapper on Instagram with an emotional post.
Bill Clinton, Cicely Tyson and others honored the Detroit-raised "Queen of Soul."
Prince Harry and Meghan Markle honored the memory of Princess Diana of Wales at their wedding.