Bill Paxton, as you've surely heard by now, has unexpectedly passed away.
He was just 61 years old.
Bill was having heart surgery, but he began experiencing complications afterwards. He had a stroke, which ultimately killed him.
He was an undeniably amazing actor, starring in such memorable films as Titanic, Twister, and Aliens.
And so it makes sense that his fellow celebrities are taking the time to mourn him, or to share stories or condolences on social media.
Check out some of the most tragic reactions to his death below.
"Bill Paxton was, simply, a wonderful man. A wonderful man..."
“Devastated by the sudden loss of my close friend and one of the finest actors in the business, Bill Paxton. Renaissance man, raconteur and uniquely American national treasure. His filmography speaks for itself. His friendship was a blessing. My love to Bunny, James and Lydia.”
"Bill Paxton was a craftsman with the kind of acting range most of us only dream of. I can't believe he's gone. Unacceptable."
"Bill Paxton could play any role, but he was best at being Bill - a great human being with a huge heart. My thoughts are with his family."
"Bill Paxton. A very talented man. As skilled with comedy as he was with drama. Carpe Diem."
Melissa Joan Hart
"Heartbroken to hear about #BillPaxton passing away! He was one of those actors that you don't think about often but appears in all your favorite films. My years have been filled with him on my screen telling great stories!"
Bryce Dallas Howard
"One of the kindest souls that ever was. We shared some very happy moments on Apollo 13. This is truly devastating. Love to his family."
Jamie Lee Curtis
"Nooooo. Bill Paxton is gone. Such a funny, talented, loving human. Louise & the children & family my love & support 2 u."
"Sad news about Bill Paxton - too young. Always humanity, decency and touches of humor shining through his work. RIP."
"Some of my favorite memories are of floating around in a tiny vessel with big hearted,hilarious,brilliant Bill Paxton. Sad day."
Jeffrey Dean Morgan
"Bill Paxton was simply one of the greatest people ever. To know him was to love him. I loved him. Huge love to Louise, Lydia and James. Xo"
"The loss of #BillPaxton is beyond crushing. Once again, an icon, far too young, gone far too soon. Goodbye Private Hudson."
"What a lovely, warm and kind human. So sad to hear of Bill Paxton's passing."
"You were a great friend to me, Bill. AND one of the finest actors to share a set with. Sending so much love to Bill Paxton's family."
"Condolences to the family of Bill Paxton. I just heard the news. "
“So incredibly sad. Praying for his family. Wow.”
"Crushing. #RIPBillPaxton A gr8 talent & spirit. His passion contributed so much 2 #Apollo13 & all his wrk. We'll miss the hell out of U Bill"
"Bill Paxton was gracious, fun and down to earth. Sent flowers once to thank me for an interview. A lovely, thoughtful, talented man. So sad."
“Bill Paxton was hands down one of the greatest guys that I have ever met. I feel lucky to have called him my friend. Bill, I love you. RIP.”
“So tragic the passing of Bill Paxton. Heartbreaking. What a talent, with so many more years of art to share with us. My love to his family.”
"Very shocked and saddened by the passing of #BillPaxton. Interviewed him several times. A class act. One of the best in the business."
"I'm devastated about the passing of Bill Paxton. He was always so kind & supportive. Funny & wise. A talented actor whom I will miss. RIP"
"A tragic & shocking loss.. such a kind & talented man, indeed."
"So profoundly sorry to hear that #BillPaxton has died. My family & I were such fans; we send our condolences and deepest sympathy to his."
"Really bummed to hear about Bill Paxton this morning. Great guy, energy and always smilin'. Strength to the Paxton family. #restinlove"