Death Play Forensic Files : Season 6 Episode 5

In 1993, 16-year-old Marie Robards suffered the devastating loss of her father Steve Robards. The death was ruled the result of cardiac arrest. One year later, she won a part in her high school production of Shakespeare's Hamlet. The lines she was required to recite onstage were more than the thoughts and feelings of her character; they struck a chord, and hinted at her own inner turmoil, from the secret she had been hiding: Barium acetate obtained in her high school chemistry class.