Twilight on the Rio Grande (1947)

In yet another version of what was probably Republic's most-used single plot--the basis for "The Leathernecks Have Landed","Rough Riders Round-Up", "Guns in the Dark", "Remember Pearl Harbor", and a couple of other films from Republic--and with revisions to fit the Autry mold, Gene Autry (Gene Autry) and his pals Dusty Morgan (Bob Steele) and Pokie (Sterling Holloway) are in Mexico, where Dusty is killed. With help from Elena Del Rio (Adele Mara), whose father has also been murdered by unknown assailants, Gene discovers that the killings tie in with a jewel-smuggling scheme.