Dennis Rader, who became known as the BTK Strangler (which stands for Bind, Torture, Kill), terrorised residents of Wichita, Kansas for 30 years, killing 10 people. By the time he was captured in 2005, he’d destroyed lives and left a legacy of destruction. Here, the investigators on the case, the families of those who were murdered and even his own daughter talk about his effect on their lives.