The Roy L. died at the age of 16. Here is all you want to know, and more!
Biography - A Short Wiki
The subject of the acclaimed 1985 film Mask, he was famous for suffering from craniodiaphyseal dysplasia, a very rare bone disorder generally accompanied by severe neurological problems.
His parents, Florence Tullis and Roy Dennis, Sr. suffered through the deaths of two sons: Roy passed away at age sixteen, and his brother Joshua died in his early thirties from AIDS.