Prince William County Police Sgt. Jonathan L. Perok displays a picture of Officer Ashley Guindon before a news conference at Western District Station, in Manassas, Va., Sunday, Feb. 28, 2016. Ronald Williams Hamilton is being held without bond in the Prince William County Adult Detention Center on charges that include murder of a law enforcement officer. He is accused of shooting and killing Guindon after she and other officers answered a domestic violence call at the Hamilton home Saturday evening. (AP Photo/Jose Luis Magana), APTOPIX