Watch the FULL episode here: http://goo.gl/lqEOu8
Part 3: http://goo.gl/ZutIUS
Part 4: http://goo.gl/MHoZrN
Part 5: http://goo.gl/IUaX9Q
Part 6: http://goo.gl/srPgfX
What would drive a church-going Springfield, Missouri, woman and her daughter to fatally poison two family members with anti-freeze, and attempt to kill a third over a 14-month period? Diane Staudte and daughter Rachel both confessed to the murders of Diane’s husband, Mark, and her son, Shaun, and to attempting to kill her daughter Sarah, and are both serving life terms in prison.
ABC News correspondent Deborah Roberts sits down exclusively with Sarah Staudte, the surviving victim, who describes how she discovered that her mother wanted her dead. The hour also features chilling, never-before-seen, interrogation tapes of Diane and Rachel Staudte, describing, in their own words, how and why they did it, as well as interviews with detectives, prosecutors, and friends and family members of the victims.