We hear the shocking testimony of John, ex-boyfriend of pyschopath Joanna Dennehy. In 2013, she brutally stabbed three men to death and attempted to kill two more, becoming only the third woman in the country to be sentenced to life without parole.John's friendship with Dennehy blossomed while he was walking his dog in the park. When it later turned into a relationship, he had no idea what the future would hold, and was delighted when their first daughter was born. However, Joanna's behaviour unraveled, until she was drinking heavily, using drugs and cheating on John.She disappeared, leaving John to look after their daughter alone. Unbeknown to him, she had become violent and was spending time in and out of prison. When she did get in touch again, for the sake of his daughter, John took her back into the family home. They had another daughter, but Dennehy's behaviour deteriorated again, driving John to move away with their daughters for good.Crime experts describe how Dennehy's world descended into sexual exploitation and violence. It came to a sickening end when she stabbed three men to death and hid the bodies in a wheelie bin before dumping them in the countryside.John describes the unimaginable moment he received the text message that ripped his world apart – she had killed three men in cold blood and would go on to brutally stab two more men multiple times, leaving them for dead. He speaks of the shock he felt when he learned about the gruesome details of the murders, and how he wrestled with breaking the news to his beloved daughters. Now, he looks to the future and describes how he has worked hard to build a stable home life for his daughters.