In the gripping conclusion of "The Case of the Black Swan," the former ballerina herself speaks for the first time, revealing her side of the story behind the fatal shooting of her estranged husband. Jim Axelrod reports in this full episode of "48 Hours." But will her testimony change your perspective on this shocking crime? Find out now! CASE UPDATE: Ashley Benefield was sentenced to 20 years in prison followed by 10 years probation. #48Hours #TrueCrime