Mary-Louise Parker,Lisa Boyle in Let The Devil Wear Black (1999)

A college student launches an investigation into his wealthy father's death when he suspects his mother and his uncle may have been involved. His suspicions seem cemented when the two announce their impending marriage only shortly after the death. The student's girl friend is also revealed to be increasingly unstable as the investigation progresses. Satch also is revealed to be deeply involved, but the connection has to be found.