In July 1989, 3-month-old Ryan Stallings became so sick that his parents rushed him to a hospital in St. Louis. Tests found antifreeze in his blood. Doctors believed he had been poisoned, so Ryan was taken from his parents and placed in foster care. From then on, they could only see him during short, supervised visits. In early September, just days after a visit in which his mother, Patricia, fed him a bottle, Ryan fell ill again. Police found antifreeze in the family's basement and arrested Patricia. On September 7, Ryan died. At the time, Patricia was pregnant. In February 1990, while she was waiting for trial, she gave birth to a second son, David Jr. He was taken from her right away. Soon, David Jr. developed the same symptoms, even though he had never been in his mother's care. This time, doctors found the real cause: a rare genetic disorder called methylmalonic acidemia, which can look like antifreeze poisoning on lab tests. Even so, in January 1991, a jury convicted Patricia of first-degree murder, and she was sentenced to life in prison. Months later, her story aired on "Unsolved Mysteries." A scientist watching the episode retested Ryan's blood and found no antifreeze at all. Ryan had suffered from the same disorder as his little brother. In September 1991, prosecutors dropped the charges and apologized. Patricia had spent nearly two years behind bars for a crime that never happened.