I remember watching this sometime in the mid 80’s and has stuck with me, it’s either a movie or an episode of an anthology like Tales From the Darkside or something.

What I remember is whenever a man looks into a mirror, he sees this figure coming from behind him and wants to strangle him from behind, but it’s not there when he turns around.  So he becomes a recluse and has to cover everything in his house that could give a reflection so he doesn’t see this figure that wants to kill him.  By the end, the local news catches wind of his story and he agrees to an interview.  So they’re at his house with everything covered up, but one thing they forgot was the camera lens! The lense is so dark he doesn’t realize the entity is coming up behind him until it’s too late and he basically gets killed on live tv.

Thanks for the help!!