Three cases of teachers crossing the line with students.

These disturbing cases of child abuse resulted in the parents going to prison. Florida mother Shauna Dee Taylor, will spend more than a decade behind bars after poisoning her baby. Stephen Bodine of Wichita, Kansas was found guilty of horrific abuse and murder of 3-year-old Evan Brewer. The infant son of Robert James Burnette and Megan Hendricks died at 9 weeks old.

S1/EP17 Justin DeWitt turned an undercover officer's stomach when he said he wanted the man, his wife and his kids all dead. "He was so cold ... it was sickening," the undercover officer says.

S1/EP1 Watch surveillance footage of serial killer Israel Keyes abducting a woman from a coffee stand.

S1/EP4 From sexual assault to murder, the phenomenon of people live-streaming crimes is rapidly growing. How are these disturbing streams disrupting traditional investigative techniques?

Studies show that only 6% of sexually abused students report their teachers.

S1/EP99 Payne Lindsey asks experts about the Tara Grinstead case.

S1/EP5 Stephanie meets with Historian Dixie Hibbs.