Bonanza (1959)

S4E31 Thunder Man

Little Joe's 19-year-old girlfriend tragically loses her life at the hands of a well-meaning explosives expert who was trying to help her uncle after he had a stroke. The man cannot speak, leaving the Cartwrights with little to go on in their investigation. The only lead he provides is a hastily written title of a song he was whistling at the time: "New Orleans Woman."