The Alfred Hitchcock Hour
Season 3, Episode 17:
An Unlocked Window
Original Air Date: 15 February 1965
Excellent quality complete episode from cable.
A third murder in the last two weeks is reported over the television, and police confess they have a psychotic madman on the loose, preying only on live-in nurses. One dark, stormy night, Nurse Stella Crosson (Dana Wynter) and Nurse Betty Ames (T.C. Jones) are tending to their employer, a man with a heart condition who resides in a creepy old mansion. A phone call from the murderer informs the women that he knows they're alone, and intends to pay them a visit before the night is over.