"It's sad to see that that this is becoming more commonplace in communities across the nation," O'Flynn said.
Webster, a middle-class, lakeside suburb, now is the scene of violence linked to house fires for two Decembers in a row.
Last Dec. 7, authorities say, a 15-year-old boy doused his home with gasoline and set it ablaze, killing his father and two brothers, 16 and 12. His mother and 13-year-old sister escaped with injuries. He is being prosecuted as an adult.