Perry Mason (1957)

S1E2 The Case of the Sleepwalker's Niece

One night, Peter Cole is discovered sleepwalking with a letter opener, looming ominously over his wife Doris's bed. Startled and frightened, Doris resolves the next day to seek a divorce. A year later, as the finalization approaches, Frank Maddox, Peter's business partner, pays a visit to Doris. That evening, Frank stays over at Peter's house, swapping bedrooms with Peter's stepbrother, Phillip Kendall. The following morning, Phillip is tragically found dead in his bed, leading to Peter being charged with murder.