Wikimedia Commons/Harry Potter HBO series Celebrity Cillian Murphy denies playing Voldemort in the new Harry Potter series. The Peaky Blinders star shuts down casting rumors. March 16, 2026 AceShowbiz - Cillian Murphy, known for his role as Tommy Shelby in Peaky Blinders, has firmly denied rumors that he will portray Lord Voldemort in the upcoming Harry Potter television series produced by Warner Bros. and set to stream on HBO.