Coming, Mama - S6.E26

Lucy Baldwin wishes to marry her boy friend Arthur. Unfortunately, her domineering mother believe that Arthur is only out for money opposes the marriage. When Lucy's mother falls ill, Lucy sees her chance. She slips her a fatal dose of sleeping tonc and she dies. Lucy and Arthur are married and Arthur takes Lucy to visit his mother. Unfortunately, Arthur's mother is just as domineering as Lucy's. Since Arthur's mother is ill, Lucy suggests a dose of sleeping tonic to take care of the problem.