Terri Harris was a loving mom who had no way of knowing that the man she'd met online had a dangerous history of crime, violence and abuse; he would go on to embark on a shocking murder spree that would leave him branded a psychopath.

Jennifer Poole's life tragically changed when she met Gavin Murphy; over the course of their relationship, Jennifer became subdued and distant; it was only after her brutal murder that her family uncovered Murphy's appalling treatment of Jennifer.

Tai O'Donnell was a talented musician, but his ambitions were cruelly cut short after he met Kamila Ahmad; Kamila managed to hide her violent past and keep control of Tai, and when he tried to leave, she stopped him in the most brutal way possible.

Canadian Ashley Wadsworth met Jack Sepple online when she was just 12 and he was 15; Ashley travelled to the UK when she turned 18; knowing nothing about Jack's evil side, she only experienced his true character when they moved in together.

Dawn Walker met Thomas Nutt online, and from the very beginning he tried to control every aspect of her life; he manipulated her into marriage, and their wedding day was the last time Dawn's family would see her alive.