Has a forensic document expert unmasked the anonymous author of the infamous Circleville letters? For nearly two decades, an anonymous letter writer terrorized the small town of Circleville, Ohio, by sending threatening letters that exposed alleged secrets about neighbors and friends. Erin Moriarty and 48 HOURS investigate the true crime mystery behind the letters and interview experts about the documents.

A former ballerina shoots her husband. Did she kill to save herself or was it out of spite? "48 Hours" contributor Jim Axelrod reports.

Axelrod and 48 HOURS report on the case through interviews with Robb, Doug Benefield's family and attorney, students of the failed ballet studio in Charleston, S.C., and more.