Death Rides the Plains (1943)

"HE'S HEADIN' INTO TROUBLE! It's Bob At His Shootin' Best As He Hooks Up With Killers!"

A couple of crooks have repeatedly sold the Circle C Ranch to unsuspecting buyers, whom they summarily rob and kill before signing the papers. Enter Fuzzy Jones, whose cousin Luke was one of the unlucky would-be ranchers, and Rocky Cameron who goes undercover as a fellow outlaw to catch the murderers.