Great White (1998)

aka: Shark

Summer school teacher Steve Miller (Richard Keats) finds out that one of his students was killed near a river. The local sheriff (Terry Arrowsmith) thinks that a mountain lion could have killed him. Steve doesn't think so. Soon an old drunken sailor spots the shark and runs into a bar and tells everyone, but no one believes him. Also stars Stephanie Rose Allen and R.J. Collins.