Willson, a postdoctoral scientific researcher from leafy Chertsey just west of London, had only been in the United States for two days when he died in the freak incident.
Laundrie also sent text messages between his and Petito's cellphone for days after strangling Petito to death in an attempt to make police believe that she was still alive.
Ateeq denied all the charges and said she believed her accuser intentionally lured her into a religious discussion to take revenge after she refused to be friendly with him.
The victims, which included a man, a woman, a teenager and a baby, were separated from a group of Indian nationals who had walked across the border waiting for someone to pick them up.
One of the officers was accused of sexually assaulting a woman at a party on the same day he fired another for having an affair on duty and then lying about it.