Body camera video shows police arriving at the scene of a double homicide in Herndon.

Body camera video obtained by FOX 5 shows the moments when police and emergency responders arrived at the scene of a double homicide in Herndon. After months of investigation, police later learned that Joseph Ryan’s murder was part of a larger plot orchestrated between au pair Juliana Perez Magalhas and her employer Brendan Banfield to kill Banfield’s wife Christina. The 37-year-old woman was allegedly stabbed to death by her husband, who now faces murder charges for her and Ryan’s deaths. Perez Magalhães entered into a plea deal.