Denis O'Hare. Actor: Dallas Buyers Club. Denis Patrick Seamus O'Hare is an American actor, singer, and author noted for his award-winning performances in the plays Take Me Out and Sweet Charity, as well as portraying vampire king Russell Edgington on HBO's fantasy series True Blood. He is also known for his supporting roles in such films as Charlie Wilson's War, Milk, Changeling, and Dallas Buyers Club. In 2011, he starred...