The Evil Touch (1973)

Season 1: Episode 2

A wealthy woman who's raised a nephew in luxury has tolerated the insolent young man long enough. She informs the ingrate that she's changing her will to remove him as sole heir to her estate. Before she can act, he intends to exploit her heart condition and pin the murder on "the monster", a crazed killer roaming the countryside. Richard doesn't realize that the aunt is already anticipating his scheme.