Assassinations: Legacies of tragedies (13 images)

Mourners observe a national moment of silence at 9 A.M. MDT two days after a young gunman shot and killed six people incuding U.S District Judge John Roll and critically wounded U.S Representative Gabrielle Giffords in Florence, Arizona on January 9, 2011. The assassination attempt occurred near a northern Safeway in Tucson on January 8, 2011. UPI/Gary C. Caskey