The Unholy Wife(1957)

HALF-ANGEL......HALF-DEVIL, she made him HALF-A-MAN! ...she flaunted his hopes, taunted his dreams, turned his peaceful valley into a volcano of seething passions that even murder could not stem!

A woman marries a man for his wealth, then concocts a plan to kill him, take his money, and run off with her lover. Things go wrong when they accidentally kill the wrong person.