The family of actor Cameron Boyce has confirmed the Disney star has died at the age of 20.
A spokesperson said he passed away in his sleep after suffering a seizure.
He made his acting debut in the horror film Mirrors but is best known for roles in Disney's Descendants and the TV show Jessie.
His death was confirmed on the evening of Saturday 6 July and linked to "an ongoing medical condition".
"It is with a profoundly heavy heart that we report that this morning we lost Cameron," a spokesperson said on behalf of his family.
"He passed away in his sleep due to a seizure which was a result of an ongoing medical condition for which he was being treated.
"The world is now undoubtedly without one of its brightest lights, but his spirit will live on through the kindness and compassion of all who knew and loved him.
"We are utterly heartbroken and ask for privacy during this immensely difficult time as we grieve the loss of our precious son and brother."
Cameron Boyce was only nine years old when he appeared in Mirrors. He then went on to play one of Adam Sandler's children in the movie Grown Ups.
However it was on the Disney channel show Jessie that he became most well known as the character Luke Ross.
That led to him playing the part of Carlos de Vil in Descendants, the popular TV movie series which follows the lives of the children of Disney baddies.
Tributes have been paid by his fellow actors and fans.
Adam Sandler posted a message on social media saying Cameron Boyce was "the nicest, most talented, and most decent kid around".
Cameron's Jessie co-star Skai Jackson wrote an emotional tribute to her friend, who she starred alongside for four seasons.
"Cam, you were one of a kind. My heart will be forever broken," she wrote alongside a number of videos featuring him.
And Descendents stars Keegan Connor Tracy and Wendy Raquel spoke about Cameron's "infectious" smile and energy.
View this post on Instagram
Darling, sweet Cameron. I find this news unfathomable, that a brilliant light such as yours could be gone. I think immediately of your beautiful smile, your infectious energy and your absolutely boundless talent. You, the baby of the crew, so young they were forever pumpkining you out for ‘fake Carlos’. To have watched you spin your way through these years with kindness and humility and just begin to come into your own...it is cruel and ugly to see that taken away. I send an ocean of love to your family with whom you were so close and who must be drowning in heartache. As a mother I simply cannot comprehend. It is small comfort that at least you shone more brightly in your few years than most do in a lifetime. Dance through the stars, keep shining. I just still cannot believe. 🖤
View this post on Instagram
My dearest Cameron...my forever Carlos❤️I’m at a total loss of words, my heart is aching, praying for your precious family, I love you Victor! You came into my life for: A Reason: To shine light and laughter in dark and hidden spaces-Thank you Cameron! A Season: we had so much fun creating magic on the set and at @amazinggraceconservatory A Lifetime...precious memories that I will cherish forever! Iconic characters tethered together forever! Wow, everyday is a present, a gift from God! Today I Celebrate your life, legacy and love you brought to the world Cameron! I will never forget your infectious smile and how you made me feel, I’m so thankful our lives intersected! You are #Amazing❤️❤️🙏🏾❤️ #RestWellMySon
A Disney Channel spokesman described him as an "incredibly talented performer".
They said: "From a young age, Cameron Boyce dreamed of sharing his extraordinary artistic talents with the world.
"As a young man, he was fuelled by a strong desire to make a difference in people's lives through his humanitarian work.
"He was an incredibly talented performer, a remarkably caring and thoughtful person and, above all else, he was a loving and dedicated son, brother, grandson and friend.
"We offer our deepest condolences to his family, cast mates and colleagues and join his many millions of fans in grieving his untimely passing. He will be dearly missed."
Cameron Boyce had shared a black and white photo of himself on Instagram the day before he died.