William Arthur Robinson, a retired Navy Captain from Coronado, California, was killed on February 9, 1988, in San Diego. He had been surveying undeveloped land in an empty canyon in the North Park area that was being considered for development. Robinson lost his car keys and sent a friend, Dan Carnthwaite, to retrieve a spare. When Carnthwaite returned he found Robinson’s body; Robinson had suffered stab wounds to the neck and blunt force trauma to the head.

No suspects have been identified and the case remains unsolved. Investigators are seeking new information that could break the case. If anyone was in the North Park canyon area on February 9, 1988, or has information about Robinson’s work there or contacts he might have made, please come forward.