Murder by Television (1935)

Stars: Bela Lugosi, June Collyer, Huntley Gordon
Director: Clifford Sanforth

The inventor of a new method by which television signals can be instantaneously sent anywhere in the world, refuses to sell the process to television companies. On the night of his initial demonstration broadcast, the inventor is mysteriously murdered and it falls to the Police Chief to uncover who the murderer is from the many suspects present!