What creates a monster? As the popular new Netflix series Dahmer - Monster: The Jeffrey Dahmer Story pushes the heinous crimes of the notorious serial killer back into the spotlight, what can we learn about what may have made him the evil he was? Do chilling home videos of Jeffrey Dahmer as a little boy show an innocent child before he became evil? Or, were the signs already there? His father reveals the red flags he says he missed.

Watch more from part one: In The Presence of Evil: Face to Face with Jeffrey Dahmer

Watch more from part two: Raising Evil: The Interview with Jeffrey Dahmer's Father