He Knows You're Alone(1980)
OVERVIEW
A reluctant bride-to-be is stalked by a serial killer who only kills brides and the people around them. While her friends get whacked one by one, a hard-boiled renegade cop whose bride had been killed years before tries to hunt the killer down before it is too late.
TAGLINE:
Every girl is frightened the night before her wedding. But this time...there's good reason!