Dick Powell's Zane Grey Theatre (1956)

S2E24 Three Days to Death

An individual from the East discovers that his sibling has been murdered in the West and embarks on a quest to track down the culprit. He soon realizes that the murderer’s identity is known, yet the authorities lack the manpower to pursue him effectively. Determined to seek justice for his brother, he takes matters into his own hands, navigating a treacherous landscape filled with danger and deception.