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As of Thursday, efforts to find Jeffrey May, 45, had turned up no sign of him, lifeguards said. No plans to resume have been made.

San Diego police on Thursday issued a missing persons bulletin for May, in hopes that someone may come forward with more clues in his disappearance.

May went to the northern San Diego beach early Monday, telling his wife he planned to meet up with a diving group he had contacted online, according to lifeguards.

When May failed to return home or call his wife again for about 12 hours, she reported him missing.

May's car was found in a parking lot in the area, and a plastic tub holding his car keys, sunglasses and clothing was located in a grassy area along the beach. May had rented a scuba tank and some diving weights at a nearby dive shop, but authorities could find no one who saw him entering the water.

Dozens of lifeguards spent several hours on Monday, Tuesday, Wednesday and Thursday searching the area in boats, aided by a Coast Guard helicopter.

May's wife told authorities her husband had been a scuba-diving enthusiast for 18 years. A friend of his, however, said May had not gone on a dive since last summer.

May's wife said La Jolla Shores was one of her husband's favorite spots and he was familiar with the area.