Word of the Law: Death Mask Collector's Edition

You're an F.B.I.S.K. detective who investigates particularly serious crimes connected with serial killers. Audrey Parker, a police officer, tells you that there is a serial killer in the city: several corpses wrapped in plaster were found recently and all of them were in the form of sculptures. The main suspect is Chad Hill whose sculpture gallery was burned and the truth about the arson is being concealed for it's connected with the local authorities and, of course, money. Now he wants to avenge it. Will you manage to break off the chain of vengeance murders and stop Chad, or not?