a gun stashed in the dryer. a man's glove, but whose dna? a woman with a whole lot to reveal. >> no, no, no, no, don't take it off. >> she tossed her top to me. >> she just whipped it off. >> i was shocked. ♪♪ hello and welcome to "dateline". keith bryan was a devoted fire chief that spent his career helping those in trouble. the local hero had the job of his dreams and the wife he adored. then one night a gunshot in the couple's home shattered the life that they had built and exposed scandalous secrets at the heart of a complicated crime. here is andrea canning with "mystery in mustang." ♪♪ just about 20 miles southwest of downtown oklahoma city sits a town called mustang.