Three cases of teachers crossing the line with students.

Well-known saddle maker Billy Junior Shaw passes away from an apparent heart attack at his home in Cartersville, Alabama. Police later find reason to question the natural death after rumors about drugs and embezzlement come to light. Could his stepdaughter, nurse Karri Willoughby, have anything to do with his death?

S1/EP1 Jeff Glidewell, the final patient of Christopher "Dr. Death" Duntsch, said he saw three black cats the morning of his surgery. "I thought this must be a sign or something," Glidewell recalls.

S1/EP1 Caitlin Linduff, the daughter of Kellie Martin, and Kellie's husband, Don Martin, remember when Kellie went into surgery with Christopher Duntsch, a neurosurgeon dubbed "Dr. Death" by the media. Duntsch was later charged with injury to an elderly person, and he was sentenced to life in prison for the botched surgery.