Phoenix police were searching Wednesday for a 70-year-old man suspected in the shooting of three people , one of whom died , in an office building . Arthur Douglas Harmon had gone to the building to discuss `` some type of litigation , '' Phoenix Police Public Information Officer Tommy Thompson told CNN affiliate KTVK . After the meeting , at about 10:30 a.m. ( 12:30 p.m . ET ) , Harmon shot Steven Singer , 48 ; a 43-year-old man who was in critical condition , and a 32-year-old woman , Thompson said . The law firm of Osborn Maledon identified one of its attorneys , Mark Hummels , as one of the victims . He was involved in a client mediation when he was shot , the Phoenix firm said . `` We believe the two men were his targets , '' Thompson said . The woman , whose injury was not life-threatening , `` just happened to be in the way when the shooting occurred . '' Harmon then fled in a 2013 Kia Optima , Arizona license plate AVS-2052 , he said . Harmon shot at a witness who was following him , Thompson said . `` Anybody who contacts him needs to be aware that he is armed and dangerous , '' he said . Two other people who were not shot were also taken to a hospital , one for `` some other type of injury not related to gunfire , '' and the other `` may have been related to stress , '' Thompson said . Former astronaut Mark Kelly referred to the shooting during a Senate Judiciary Committee hearing in Washington on gun violence . `` There 's 50 or so police cars on the scene , '' he said . Kelly and his wife , former Rep. Gabrielle Giffords , D-Arizona , this month launched Americans for Responsible Solutions , which seeks to raise money to counter the influence of the gun lobby . Two years ago , Giffords was shot in the head by a gunman in a parking lot in Tucson .
One of three shooting victims dies of injuries , Phoenix police say . Other shooting victims have non - life - threatening injuries , police say . Police identify him as John Douglas Harmon , 70 , last seen in a white Kia .