John McCarthy Roll ( February 8 , 1947 - January 8 , 2011 ) was a United States federal judge who served on the United States District Court for the District of Arizona from 1991 until his death in 2011 , and as chief judge of that court from 2006 to 2011 .
John McCarthy Roll ( 8 February 1947 - 8 January 2011 ) was an American judge who shot dead in the 2011 Tucson shooting .