Murder by Television 1935 is an American mystery film starring Bela Lugosi, June Collyer, and Huntley Gordon. The film is also known as The Houghland Murder Case. The cast also includes Hattie McDaniel.
On the night of his initial broadcast Houghland is mysteriously murdered in the middle of his demonstration and it falls to Police Chief Nelson Mowbray to determine who the murderer is from the many suspects present.
Source: Wikipedia