Lawman S01 E15 The Captives

Jack McCall, who murdered Wild Bill Hickok, ends up in Laramie, holed up in Johnny's ailing 'Uncle' Jess' cabin. When Johnny shows up with the doctor, they are held captive. Then Johnny is sent to town for provisions so the killer can make his escape, and a suspicious Dan Troop follows at a distance. In the end, everything is resolved.