Shoot To Kill (1988)

Plot:  Sidney Poitier returned to the big screen in this action-thriller, after a decade-long absence. When a cunning murderer vanishes into the rugged mountains of the Pacific Northwest, pursuing FBI agent Warren Stantin (Poitier) must exchange familiar city streets for unknown wilderness trails. Completely out of his element, Stantin is forced to enlist the aid of expert tracker Jonathan Knox (PLATOON'S Tom Berenger). The killer has infiltrated a guided hiking trip led by Knox's girlfriend Sarah (Kirstie Alley, at the height of her Cheers fame). Viewers don't know which of the hikers is the killer, and the tension lasts well into the movie.