he's been fired for supposed bad behavior on the set, and they're replacing him with Seann William Scott of Stifler fame in the 'American Pie' movies.
He will be playing a NEW character - possibly the brother of Crawford's Martin Riggs.
Crawford responded to the news by posting a very somber art shot of himself. The caption read:
"To my cast and crew, CONGRATULATIONS on season 3! To the Fans, Thank you for the overwhelming support and love.
"Riggs was a dream role and the experience will live with me forever. My heart is full. Good Luck next season!!"