"Alfred Hitchcock Presents" The Older Sister (1956)

One year ago, Mr. and Mrs. Borden were brutally murdered in their home, and it is widely believed that their daughter Lizzie committed the crimes, even though she was tried and acquitted. Lizzie and her sister Emma are still living in the same home, but Emma now plans to leave on a vacation to rest her nerves. The sisters' housemaid Margaret is also planning to leave, to avoid being alone with Lizzie. As Emma and Margaret discuss their plans, a woman arrives at the door, and introduces herself as a newspaper reporter. Emma desperately tries to get the visitor to leave, but the pushy reporter insists on questioning Emma about all of the details of the murders, bringing Emma to a state of near hysteria. In the midst of their confrontation, Lizzie herself comes down the staircase, and immediately takes control of the situation.