Please answer the following question: Generate a question about the following movie plot: A priest practicing the Voodoo arts resurrects Matt Cordell (Robert Z'Dar), who takes his badge and comes back from the dead to do his bidding. Meanwhile, a pair of cameramen who are hoping to make it big come across a convenience store robbery, where a police officer named Katie Sullivan (Gretchen Becker) intervenes in a hostage situation; she manages to wound the suspect but realizes that the clerk is his girlfriend, and she had let him in purposefully to rob the store. There is a crossfire, and while Kate is severely wounded, she ends up killing the clerk in return. When rushed to the hospital, she is rendered comatose and brain dead, much to the chagrin of investigating officer Sean McKinney (Robert Davi). McKinney catches the report of Katie using excessive force in a hostage situation, which portrays the clerk as an innocent victim and threatens to free the badly injured Frank Jessup. Meanwhile, stalking Katie's progress, Cordell goes to the hospital to watch her. He kills one of her supervising physicians with defibrillator paddles, then exposes to high amounts of X-Ray radiation the physician set to sign the warrant to cut Kate's life support. The reporters who had framed Kate are then murdered, as well. Meanwhile, McKinney and a physician, Susan (Caitlin Dulany), are investigating the murders and the strange behavior experienced by the comatose Kate. Their investigations lead them to Houngan (Julius Harris), who admits that he had brought Cordell back from the dead, and he is interested in Kate who is on the verge of death. At gunpoint, Cordell forces Houngan to attempt the resurrection on her, but he is unable to do so, stating her spirit is refusing to return from the dead to be with him. Cordell kills Houngan, and both he and Kate are set on fire in the process; she is immolated. As they escape, Susan and McKinney are chased by Cordell, who survived the fire while remaining ablaze. He chases them in a beat up police car, while they ride in an ambulance. They manage to throw an oxygen tank into the...
A:
Who investigates the murders?