Transistor Films’ true crime series for Oxygen, examining the turmoil and devastation of discovering that someone you share your life with is a serial killer. Sisters, daughters, sons, ex-partners and best friends share how their loved ones were hiding horrendous secrets and carrying out incomprehensible crimes. From the team behind I Am A Killer, each episode focuses on a different case, including Levi Bellfield, Anthony Sowell and the Tourniquet Killer, told through the eyes of those closest to the perpetrators. Now in its second season.