A knife was discovered that may be linked to the murder of a Hammonton mother and son. Sunday, at approximately 5 p.m., The Hammonton Police Department responded to a report of a knife found in the yard of a Hammonton residence on 12th Street. The knife was seized by the Hammonton Police Department and turned over to the Atlantic County Prosecutor’s Office Major Crimes Unit. The knife has not been confirmed to be the weapon used in the murder of Diana and Ryan Patterson last week. The knife has been submitted for scientific testing.