Dustin Diamond’s Saved by the Bell co-stars are paying tribute to the actor, who died earlier today at 44 years old from stage 4 lung cancer.

“Dustin, you will be missed my man. The fragility of this life is something never to be taken for granted. Prayers for your family will continue on,” Mario Lopez, who played A.C. Slater, tweeted. Mark-Paul Gosselaar (Zack Morris) wrote that he was “deeply saddened to hear of the passing of Dustin Diamond, a true comedic genius. My sincere condolences to his family and friends. Looking back at our time working together, I will miss those raw, brilliant sparks that only he was able to produce. A pie in your face, my comrade.” On Instagram, Tiffani Thiessen (Kelly Kapowski) called life “extremely fragile and it’s something we should never take for granted. God speed Dustin.”