Bonanza - Season 7 Episode 5
The Lonely Runner

A judge awards itinerant horse breeder Jim Actons beloved mare to rancher Sam Whipple. Jim tries to buy her back, but Whipple refuses his offer, after which a fight ensues and Jim kills Whipple in self-defense. The Cartwrights want to bring Jim in to make sure he receives a fair trial, but an ambitious and overzealous deputy doesnt care how he brings him in.