The coroner's report described the 20-year-old Disney Channel star's death as a "sudden unexpected death in epilepsy."
"This is a fear I live with all the time."
He "talked me down from countless ledges, talked me through eating disorders, helped me out of a dark relationship and through endless breakdowns," she said.
The Disney Channel star died on Saturday at the age of 20.
The 20-year-old actor died after a seizure resulting from an ongoing medical condition.