What does Marie force Katie to come to terms with regarding Matt?

As dinner wraps up, Katie recalls how Luke and Matt called the police the night Marie showed up at their house. Marie explains how she saw her father kill Laurie. The police go to the Pye farm to arrest Calvin, but he kills himself before they can arrest him. After Laurie's body is found, Mrs. Pye is taken to a mental hospital, where she eventually dies, and Rosie is sent to live with relatives. Matt takES over the farm, burning down the shed where Laurie was killed and fills in the pond where Laurie's body was found.