Night of the Stranger - S7.E22

A psychiatrist takes refuge in the home of a stranger when one of her patients tries to run over her with his car. (He didn't take the news that he was going to be committed very well.) After stalking the house and terrorizing the pair for hours, the patient finally leaves. The doctor and homeowner attempt to escape, but the deranged man returns, more desperate than before to break into the house.