Stranger At The Door: How a Plano Grandmother May Have Stopped a Suspected Serial Killer

When a stranger knocked on Mary Annis Bartel’s door on a warm spring day in North Texas, she had no idea who stood on the other side. A man forced his way into her home, brutally beating her, stealing valuables, and leaving her for dead. But the 90-year-old grandmother survived the vicious attack, and the clues she gave police led them to a suspected serial killer.