Inside the Texas Crime Lab Cracking Hundreds of Cold Cases [Video]

Allison Brocato last saw her sister alive on the afternoon of January 13, 1995. It was a Friday, and Catherine Edwards, Allison’s 31-year-old identical twin, had just gotten off work at Price Elementary School, in Beaumont. On her way home, Edwards stopped to pick up her beagle, whom Brocato had been dogsitting. She lingered a few minutes to chat and to play with Brocato’s infant daughter. “She seemed kind of sad that day,” Brocato would later recall. “I think she had had a fight with an ex-boyfriend the night before.”

Brocato and Edwards considered themselves best friends. After graduating from Lamar University, they both got jobs as public school teachers and moved into a modest town house in west Beaumont, where they lived together until Brocato got married. The sisters looked so alike—a bit shy of five feet tall, slim, with pale skin and shy smiles—that their high school yearbook …