"I'm shocked and saddened to hear the news about my dear friend @carrieffisher. Our thoughts are with Carrie, her family and friends." - Harrison Ford via Twitter
"no words #Devastated" - Mark Hamill via Twitter
"There are no words for this loss. Carrie was the brightest light in every room she entered. I will miss her dearly." - Peter Mayhew via Twitter
"I am extremely sad to learn of Carrie's passing. She was wonderful to work with. Condolences to her friends, family & fans around the world." - David Prowse via Twitter
"I thought I had got what I wanted under the tree. I didn't. In spite of so many thoughts and prayers from so many. I am very, very sad." - Anthony Daniels via Twitter
Noteworthy: Kenny Baker who played R2 died on August 13, 2016.
Edit: Thanks, nin.
"Hard times create strong men. Strong men create good times. Good times create weak men. And, weak men create hard times." - Those Who Remain by G. Michael Hopf