Garner, a dental hygienist, had led an unexceptional life for most of his 59 years. But advancements in DNA technology, along with the proliferation of family genealogy databases, led authorities to consider him a suspect in the slaying of Pamela Cahanes, the 25-year-old U.S. Navy seaman apprentice who was found beaten, strangled and dumped in an overgrown Seminole County lot in 1984.