An Iowa man has pleaded not guilty to murder charges in the ambush-style shooting attacks of two police officers last month. Scott Michael Greene entered his written plea Wednesday in a court filing in which he also asked for a speedy trial. The 46-year-old is accused of carrying out the Nov. 1 attacks of Urbandale officer Justin Martin and Des Moines Police Sgt. Anthony Beminio. They were killed within minutes while sitting in their patrol cars miles apart from one another.
