Bonanza - Season 4 - Eps 31: Thunder Man
Little Joe's 19-year old girlfriend is killed by a good samaritan, an explosives expert who had stopped to render aid to the woman's uncle after he suffers a stroke. Unable to talk, the only clue he can offer the investigating Cartwrights is a scrawled title of the song the assailant was whistling — ""New Orleans Woman.""
About Bonanza

Title: Bonanza
First Air Date: 1959-09-12
Last Air Date: 1973-01-16
Status: Ended
Rating: 7.516/10 (from 441 votes)
Language: EN
Seasons: 14
Total Episodes: 431
Network: NBC
Genres: Western, Action & Adventure, Drama, Family
Production Companies: NBC, NBC Studios
Synopsis
The High-Sierra adventures of Ben Cartwright and his sons as they run and defend their ranch while helping the surrounding community.
Cast

Lorne Greene
Ben Cartwright

Michael Landon
Joe Cartwright

David Canary
Candy Canaday

Tim Matheson
Griff King

Mitch Vogel
Jamie Hunter Cartwright