Disney Channel star Cameron Boyce, who passed away Saturday at the age of 20, died from a seizure caused by epilepsy, a family spokesperson said.

"Cameron's tragic passing was due to a seizure as a result of an ongoing medical condition, and that condition was epilepsy," the spokesperson told E! News. “We are still trying to navigate our way through this extremely heart-wrenching time.”

Boyce, best known for his roles in the Disney Channel's "The Descendants" and "Jessie," had the fatal seizure in his sleep.

His loved ones are asking for privacy “so that the family, and all who knew and loved him can grieve his loss and make arrangements for his funeral — which in and of itself, is agonizing."

The young actor was mourned by many on social media, including other actors he had worked with.

Dove Cameron, who played Mal in "The Descendants," posted an emotional video to her Instagram on Tuesday in which she read an open letter to Boyce's parents.

"Over the last six years, since he was only 14, Cameron talked me down from countless ledges, talked me through eating disorders, helped me out of a dark relationship and through endless breakdowns," Cameron said.

"But what was special about Cameron was who he was in the small moments when maybe no one was looking," the 23-year-old actress said. "The moments in between the big ones when he didn’t have to be good or kind, Cameron was always good and kind. He was selfless and generous. He was magnanimous."

On Sunday, Adam Sandler, who starred with Boyce in the 2010 film “Grown Ups,” posted a photo of him on Twitter, saying “Too young. Too sweet. Too funny. Just the nicest, most talented, and most decent kid around."

Disney Channel said in a statement over the weekend that Boyce 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.”