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Incident of the Stalking Death (2x9)

Air date: Nov 13, 1959

Gil shoots and wounds a puma while while out scouting for the cattle drive. The puma escaped and kills the young son of a local rancher's widow. Gil and the guys go on the hunt for the puma along with a friend of the widow (Cesar Romero) who also happens to want to kill Gil because he's jealous of the attention the widow shows Gil.