“Buffy the Vampire Slayer” star dies at 54 – cause of death revealed – story-veterans.com

His family confirmed that he died peacefully in his sleep on Friday, March 20, from natural causes, according to reports cited by The Hollywood Reporter.

A Fan-Favorite Role That Defined a Generation
Brendon became a household name through his portrayal of Xander Harris, the witty and loyal best friend in Buffy the Vampire Slayer. Over the show’s seven-season run, his character stood out as the grounded, human presence among a world of supernatural chaos.