Backlash (1956)

Jim Slater (Richard Widmark) never knew his father, who died in an Apache ambush in Arizona. After hearing that someone may have survived the ambush and escaped with a stash of gold, Slater sets out to discover exactly what happened. Along the way, he meets Karyl Orton (Donna Reed), widow of one the men killed in the ambush, and attracts the unwanted attention of local hotshot Johnny Cool (William Campbell). A chance encounter offers answers, but Slater isn't so sure he wants to know anymore.