Wikimedia Commons/Harry Potter TV series TV Cillian Murphy denies playing Voldemort in HBO's Harry Potter series. Explore the casting rumors and how the iconic villain may be portrayed. March 18, 2026 AceShowbiz - After months filled with speculation and reports, Cillian Murphy has firmly denied rumors that he will portray Voldemort in HBO's upcoming Harry Potter TV series. Fans of the Wizarding World have been abuzz about how the iconic villain Voldemort will be depicted in the new series.