Bonanza S07 E05 The Lonely Runner

"America's Favorite TV Western"

A judge awards itinerant horse breeder Jim Acton's 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 doesn't care how he brings him in.