Who Killed Theresa?

"When he was about nineteen - which places the event in 1978 - Gerald was out driving with his older and a third person, Regis and another. Gerald was sitting in the back, Regis was in the passenger seat, and the third person was driving the car. It was in the evening, and they picked up a hitchhiker in Lennoxville. Gerald thought he and the girl were about the same age, so also nineteen. The girl got in the car and sat in the back with Gerald. Gerald began kissing her. From the passenger seat, Regis reached back and began stroking her thighs. I'm guessing it was a lot more than kissing and fondling, but you get the picture.Regis asks the driver to stop the car. He then dragged the girl with him. Some time passed, Gerald got out of the car to see what's going on. He says he was going to help the girl. Gerald went down in a field and found Regis holding the girl's head down in water. Gerald mimes the gesture of Regis holding her down in the water by the back of her neck. Regis yelled at Gerald to get back in t