A former centerfold model's death remains a mystery as investigators struggle to unravel why she found washed up on the beach of a San Diego naval base, RadarOnline.com has learned.

The body of Anneka Vasta, who was known as Anneka Di Lorenzo when she was named the 1975 Penthouse Pet of the Year, was found in a restricted no man’s land where Marines train for battle on a Camp Pendleton beach on January 4 by two joggers, reported the San Diego Union-Tribune.

Her slim, toned figure made the runners think the corpse, that had a broken neck and back, belonged to a teenager but it was later identified as the 58-year-old who once dreamed of becoming known as "the sexiest woman in the world."