Lawman (1958)

Season 4: Episode 3

Four men ride into Laramie, all carrying rifles, and station themselves around town. After one of them is shot and killed, the leader tells Dan they are searching for a young, innocent looking young man who was reported to them as being in the area. He was a cold-blooded killer they had been tracking. Dan deputizes the three remaining men since Johnny was out of town, and together they track the boy down.