Has the anonymous author of the infamous Circleville letters been unmasked?

This story previously aired on August 6, 2022. ERIN MORIARTY [reading a letter]: "Mrs. Gillispie, stay away from Massie. I've been observing your house and I know you have children." MARIE MAYHEW [reading a letter]: "Mr. Gillispie, your wife is seeing Gordon Massie. ... You should catch them together and kill them both. ... He doesn't deserve to live." MARIE MAYHEW [reading a letter]: "We know what kind of car you drive ... We know where your kids go to school ..."  ROBIN YOCUM [reading a letter]: "Everyone knows what you have done. If you don't believe us, just make them mad and find out for yourself." ROBIN YOCUM [reading a letter]: "It's your daughters turn to pay for what you've done ...  MARTIN YANT: [reading postcard] "Forget Circleville, Ohio. ... If you come to Ohio, you el sickos will pay. The Circleville writer." 

For nearly two decades, an anonymous letter writer terrorized the town of Circleville, Ohio, by sending threatening letters that exposed alleged secrets about neighbors and friends. The mystery has long intrigued TV shows, podcasters and now "48 Hours" in the quest to finally unmask the writer. ROBIN YOCUM [reading a letter] It's your daughters turn to pay for what you've done. ... I shall come out there and put a bullet in that little girl's head."

MARIE MAYHEW ["Whatever Remains" podcast]: Something pretty disturbing happened in Circleville, starting small and flourishing over decades. ... Residents ... began to receive letters that accused the citizens of being involved in some pretty terrible things — embezzlement, domestic violence, affairs, and even murder.