Demonstone

Movie (1990)
Also known as: Deathstone

Starring:
R. Lee Ermey (Col. Joe Haines)
Jan-Michael Vincent (Andy Buck)
Nancy Everhard (Sharon Gale)
Peter Brown (Admiral)

Two U.S. Marine investigators looking into a series of grisly murders in Manila discover that the crimes are tied to an amulet with a 400-year-old curse on it that has unleashed supernatural forces.