Actor Daniel Mickelson died Sunday at age 23, his sister announced Monday on Instagram. A cause of death has not yet been revealed. “My heart is shattered and to write this feels so wrong and I don’t even know what to say,” wrote his sister Meredith. Mickelson had appeared in the television series Mani and the horror film The Killer Clown Meets the Candy Man. Hollywood stars have taken to social media to mourn the actor’s death, including Paris Hilton. “You were such a light,” Hilton wrote on her Instagram story. “So sad to hear this bro. RIP.” The actor had posted pictures of himself hiking and as well as TikTok videos from a hike with his girlfriend a week before his death.