Gunsmoke (1955)

S4E11 How to Kill a Friend

Two high-stakes gamblers discover Matt's unwavering integrity and decide to use threats to bend him to their will by enlisting the services of the dangerous Toque Morlan. Unbeknownst to them, Morlan shares a deep history with Matt, having once been his close ally. Years ago, a mob assault left Morlan physically and emotionally scarred, fueling his deep-seated resentment toward law enforcement. As tensions rise, old loyalties and new dangers collide in unexpected ways.