'90210,' 'Riverdale' castmates, fans, friends react to Luke Perry's death

What You Need to Know: Luke Perry

Actor Luke Perry, best known for playing Dylan McKay on "90210," died Monday just days after having a stroke, according to his publicist.

On Thursday, representatives for Perry, who most recently starred in the television series "Riverdale," said that the actor was under observation at a California hospital amid reports that he had a stroke one day earlier.