Alter Boys

When a suspect is found burying several bodies, the subsequent investigation by Grissom et. al., appears to be an open and shut case. Grissom is dissatisfied with the simplicity of the evidence, which seems suspicious to him, especially once it turns out that the suspect is the brother of a convicted felon. If falls to Catherine and Warrick to investigate the suspicious death of a woman at a hotel spa. Was it accident, negligence, or foul play?