The Monster of Piedras Blancas (1959) - IMDb
Directed by Irvin Berwick. With Les Tremayne, Forrest Lewis, John Harmon, Frank Arvidson. The monster, which looks like a snarling "Creature from the Black Lagoon," invades a sleepy seaside town. The lighthouse keeper, newly widowed and estranged from the town folk, has been leaving food out for the monster for years, unaware of it's blood lust.