The movie you're thinking of, is called 'Reflections Of Murder', a made-for-TV movie, from 1974. It starred Sam Waterston, Tuesday Weld and Joan Hackett. I will never forget the scene where Sam Waterston's character, supposedly dead, pops up out of the bath tub. There's also a nice little twist at the end. It was remade in 1996, and called Diabolique.
I just thought of the second one--I think it's called 'Don't Be Afraid Of The Dark (1973), starring Jim Hutton and Kim Darby.