Stars from Sex and the City have paid tribute to the late Willie Garson, who appeared with them in the HBO series as talent agent Stanford Blatch.
Kim Cattrall said the actor's death at the age of 57 was "a terribly sad loss to the SATC family".
Cattrall's former co-star Cynthia Nixon also paid tribute, remembering him on Twitter as "a source of light, friendship and show business lore".
"We are bereft without him," added Kristin Davis, who played Charlotte.
"He was smarter and funnier than you ever would have imagined," continued the actress.
Ben Stiller, Jason Alexander and other actors have also posted messages.
In Sex and the City, Garson played a close friend and confidante of Sarah Jessica Parker's Carrie Bradshaw, a role he had recently been reprising in the spin-off series And Just Like That.
He also appeared in the show's two feature films, while his other roles included the conman Mozzie in the TV series White Collar.
Nixon - Miranda Hobbes in Sex and the City - said she was "deeply, deeply sad" to have lost such "a consummate professional".
"We all loved him and adored working with him," she wrote on Twitter. "He was endlessly funny on-screen and in real life."
So deeply, deeply sad we have lost @WillieGarson. We all loved him and adored working with him. He was endlessly funny on-screen and and in real life. He was a source of light, friendship and show business lore. He was a consummate professional— always. pic.twitter.com/G63EJIj8lG
— Cynthia Nixon (@CynthiaNixon) September 22, 2021
Cattrall, who appeared in the Sex and the City series and films as Samantha Jones, posted a photo of herself with "dear Willie" in her Twitter tribute.
The actor was described as "a gift from the gods" by Mario Cantone, who played Garson's on-screen partner Anthony Marentino in the show.
He was also remembered by Evan Handler, aka Harry Goldenblatt, as "a prince, the Mayor of every group he existed within [and] a consummate funny man."
Born William Garson Paszamant in New Jersey in 1964, Garson studied theatre and received a masters of fine arts from Yale School of Drama.
He then took on small roles in several popular television series in the 1980s, including Cheers, Family Ties and LA Law.
Garson went on to appear in such 1990s shows as The X-Files, Boy Meets World and Friends before making his Sex and the City debut in 1998.
His film credits include Groundhog Day, There's Something About Mary and Fever Pitch, the 2005 US adaptation of Nick Hornby's football-based novel.
The cause of his death has not been disclosed.
Michael Patrick King, the executive producer of Sex and the City and its spin-off, said Garson had been working "even while he was sick".
"His spirit and his dedication to his craft was present every day," he said in a statement. "His multitude of gifts as an actor and person will be missed by everyone."
Actor Matt Bomer, who appeared with Garson in White Collar, said he would love his former co-star forever, adding: "Rest in peace my friend."
Writer and producer Bryan Fuller also paid tribute, saying it had been "a delight" to work with the actor on his 2000s TV series Pushing Daisies.
Garson was a strong advocate for adoption. His son Nathen, whom he adopted in 2009, said he had been "so proud" of his father on Instagram.
"I'm so glad you got to share all your adventures with me and were able to accomplish so much," he said. "I will always love you, but I think it's time for you to go on an adventure of your own."
In her tribute, Davis said she first met Garson in 1995 "on the spooky night-time set of The X-Files" and remembered how he had "immediately" made her laugh.
"But I really want to pay tribute to his fearless commitment to single fatherhood," she continued. "We spoke about being single parents through adoption often. And nothing gave him more joy and pride than his son Nathen.
"I am thankful for all of the time we had and grateful that so much of your bright light is on film forever."