In 2011, 53-year-old former insurance worker Pam Hupp drove her friend Betsy Faria home from chemotherapy in Troy, Missouri. Hours later, Betsy’s husband, Russ, found his wife on the floor of their home, stabbed 55 times. Police quickly made Russ their main suspect and arrested him, while Hupp became a key witness for the prosecution.

However, the case soon began to unravel. In 2016, Hupp shot and killed another man inside her home. Prosecutors said she’d staged the shooting to steer investigators away from the Faria murder.

Hupp, now 67, is serving life without parole for killing Louis Gumpenberger. She pleaded not guilty to Betsy’s murder and is scheduled to stand trial in January 2028, more than 16 years after giving her friend that final ride home.

The case has already inspired a Dateline podcast and the NBC miniseries The Thing About Pam , starring Renée Zellweger .…