"I'm sad beyond words that Alan Thicke has passed away," Bure wrote alongside a photo of herself and Thicke on the set of Fuller House. "I've known you since I was 8 years old and so glad I had the pleasure of working with you again so recently on Fuller House."
Thicke recently guest starred on the second season of Bure's Netflix series, Fuller House, and the two also worked together in 2013 on the Hallmark Channel movie Let It Snow.
However, Thicke first entered her life when she was only a kid. Bure's older brother, Kirk Cameron, starred alongside the Canadian actor in the celebrated '80s sitcom Growing Pains.
"You were a part of my family and hockey family. You will be greatly missed," Bure's caption continued. "My heart hurts."
Bure also reposted Thicke's last tweet from earlier in the day, in which he wrote, "Season 2 Fuller House looking good. I even like the ones I’m not in!"
"Your last tweet," Bure wrote in her reply. "I'm heartbroken."
Your last tweet ❤️️. I'm heartbroken 😔 https://t.co/6GJopS0XaF— Candace Cameron Bure (@candacecbure) December 14, 2016
Other members of the Fuller House family also took to social media to share their thoughts and condolences, including Full House patriarch Bob Saget.
"So sad is the passing of Alan Thicke. Such a good husband, father, brother, and friend," Saget tweeted. "He will be deeply missed. Rest in peace dear Alan."
So sad is the passing of Alan Thicke. Such a good husband, father, brother, and friend. He will be deeply missed. Rest in peace dear Alan.— bob saget (@bobsaget) December 14, 2016
Original Full House cast member and recurring Fuller House guest star Lori Loughlin also shared her thoughts on Twitter, writing, "I'm so sad to hear about the passing of Alan Thicke. RIP Alan."
I'm so sad to hear about the passing of Alan Thicke. RIP Alan. 😢— Lori Loughlin (@LoriLoughlin) December 14, 2016
Dave Coulier also shared a memory of his time with Thicke, tweeting a photo of himself and his fellow Canadian dressed up as Mounties for a comedy sketch. Coulier wrote, "RIP Alan Thicke. We skated side by side for years. Say hello to Gordie and The Rocket."
Fuller House star Andrea Barber and executive producer Jeff Franklin also reacted to the news, sharing their love and memories of the late actor.
There are no words for how sad this is. What an honor to have been able to work with him. Rest In Peace, Alan. ❤️😥 https://t.co/gVaDcpLRqO— Andrea Barber (@andreabarber) December 14, 2016
Thicke, who was best known for playing Jason Seaver on Growing Pains, suffered a heart attack while playing hockey with his 19-year-old son, Carter, on Tuesday. He was pronounced dead at Providence St. Joseph's Medical Center in Burbank, California. He was 69.
For more on the late star's life and on-screen legacy, check out the video below.