lost twilight zone epsisode?

I have been looking for, what I thought was a Twilight Zone episode, but now I am sure it isn't. I only remember a few things about it. It was in black & white and I believe it was from the 1960s. The show was set in a movie studio that was experiencing murders. One scene showed a man high up in a camera lift who was strangled & then thrown down to his death. Even though it was witnessed by the cast & crew they could not see anyone choking the man. The crew then argued amongst themselves about weather the man fell or was thrown to hid death. The final scene of the show pitctured a silouette of a huge hairy creature strangling a man behind a movie screen indicating that an invisible monster was responsable for all the murders on the set. I have been going crazy looking for this show for over 30 years. Ay help would be appreciated. Thanks Jack @ [email protected]