Can someone please tell me where I saw this?!?

I saw something on the Chiller channel within the last 3-4 years. I want to think it may have been an episode of "Night Gallery" or maybe "The Twilight Zone"or it very well could have been a movie.. It was definitely made in the 60's. It was about a doctor and his assistant who conduct an experiment where they kill someone and then bring them back to life. They perform this experiment on a younger, more attractive man whom the doctor's much younger wife falls in love with. The doctor is aware of this and isn't happy about it. At one point, the experiment goes wrong and they aren't able to bring the man back to life. I'm not sure exactly what happens next, but I want to think that the doctor discovers that the experiment DID work, but it had a very delayed reaction. Also, I think the doctor's assistant dies at some point. At the end, the doctor's wife goes running into the mausoleum where the man is buried. She opens the door to his tomb and he is alive, possibly a zombie. I would love if anyone could PLEASE give me some sort of idea of what this was. Thank you in advance!