Career

Davis was released from prison in 2007 after accepting a plea deal and confessing to the crimes. In September 1981 in Lewisburg, West Virginia, Davis"s infant son, Seth, had suffered massive damage to his brain, which prosecutors believed was caused by an injection of a large amount of insulin. He was later moved to a mental institution where he spent the rest of his life.

Several months after the incident with Seth, on 11 March 1982, Davis"s three-year-old daughter, Tegan, died of a caffeine pill overdose.

Doctor Anne Hooper, who performed the autopsy on the girl, had found hundreds of capsules inside of the digestive tract, where she then concluded that the manner of death was likely a homicide. In 1997, Davis was put on trial for the murder of Tegan and the injury to Seth.

Apart from this, Doctor Barry Wolfe believed that Tegan had suffered from the same genetic disorder. Tegan had been diagnosed with Reye"s Syndrome shortly after her death in 1982, in Marybeth"s defense, these details contradicted Doctor Hooper"s report that Tegan was murdered.

Although these details were present, Davis received a life sentence without the possibility of parole.

Seth Davis died on 10 October 2002 at the age of 21, and his death was recorded as a homicide. After signing a plea deal and giving a one-word confession in 2007, the then 55-year-old Marybeth Davis was released from prison. In 1999, A&East series Cold Case Files featured the case on their episode, "Maternal Instinct."

In 2005, television series Guilty or Innocent? detailed the events on an episode titled "The Mary Beth Davis Case.".