The Monster of Piedras Blancas 1959

A small coastal town is haunted by a spree of horrific murders. The victims include a talkative shopkeeper, a little girl, two brothers out fishing, and a sheriff’s deputy. A pair of scientists and the sheriff are baffled at the cause of these slayings until they run into a Creature of the Black Lagoon style monster. The monster is a missing link between water-breathing and land-breathing creatures and is prehistoric. It turns out that the grumpy lighthouse keeper has been feeding the monster for the last ten years. After a final showdown between the creature and the lighthouse keeper, both are killed. One at the hands of the monster and the other by being pushed off the top of the lighthouse after being disoriented by the bright light. IMDB