This Book is referred to by It written by Stephen King
When Beverley Marsh mentions the "crazy cop" murders in Castle Rock, she is referencing Frank Dodd from The Dead Zone
It is about Johnny Smith, who is injured in an accident and enters a coma for nearly five years. When he emerges, he can see horrifying secrets, but he cannot identify all the details of his "dead zone", an area of his brain that suffered permanent damage as the result of his accident.