Actor Willie Garson has died at the age of 57.
He was best known for playing Stanford Blatch on Sex and the City and was Sarah Jessica Parker's character's best friend.
The sad news was confirmed by Garson's son, Nathen, who described him as the 'funniest person I know'.
"I love you so much papa," he said in a post on social media. "Rest In Peace and I'm so glad you got to share all your adventures with me and were able to accomplish so much. I'm so proud of you.
"I will always love you, but I think it's time for you to go on an adventure of your own. You'll always be with me. Love you more than you will ever know and I'm glad you can be at peace now.
"You always were the toughest and funniest and smartest person I've known. I'm glad you shared your love with me. I'll never forget it or lose it."
A cause of death isn't yet known.
Sex and the City executive producer, Michael Patrick King has released a statement saying the show's 'family has lost one of its own'.
"Our amazing Willie Garson," he wrote. "His spirit and his dedication to his craft was present every day filming 'And Just Like That.' He was there - giving us his all - even while he was sick.
"His multitude of gifts as an actor and person will be missed by everyone. In this sad, dark moment we are comforted by our memory of his joy and light."
Garson's on-screen partner on the series has also paid tribute to the late actor.
Mario Cantone wrote on Twitter: "I couldn't have had a more brilliant TV partner. I'm devastated and just overwhelmed with Sadness. Taken away from all of us way soon. You were a gift from the gods. Rest my sweet friend. I love you."