Celebrities Adam Sandler, Peyton List, and Kenny Ortega have mourned the sudden demise of young actor Cameron Boyce on Saturday.

The 20-year-old, best known for his roles in Disney's Descendants and the TV show Jessie, passed away in his sleep after suffering a seizure on Saturday. 

Sandler, who had worked with Boyce in films Grown Ups and Grown Ups 2, penned an emotional note on Twitter. He wrote: "Too young. Too sweet. Too funny. Just the nicest, most talented, and most decent kid around. Loved that kid. Cared so much about his family. 

"Cared so much about the world. Thank you, Cameron, for all you gave to us. So much more was on the way. All our hearts are broken. Thinking of your amazing family and sending our deepest condolences."

Ortega tweeted: "Cameron, may the love and light you spread throughout your brief life, soar you with flight into the heavens above. You were already an Angel in life. The legacy you leave is magnificent! Love you my forever boy."

Actor Peyton List, who played Boyce's sibling on Jessie, shared how he helped her become a better person.

"He was younger than me but taught me how to spread love and kindness more than anyone that has ever been in my life. He lifted everyone around him, and inspired/pushed me to be a better person than I ever would've been without his guidance, patience, and love."

"I can barely see my eyes anymore from crying so hard. I love you with every ounce of me, and I thank you for the time I had with you, being in my life, and being my brother forever and always...Heaven has gained a beautiful soul," she wrote on Instagram.