Isaiah Quiambao, 16, from left, Franklin Watkins, 18, Patrick Woodruff, 17, and Crystal Watkins, 16, all students at Chapparal High School and friends of Tanner Chamberlain embrace during a vigil for Tanner on the one year anniversary of his death in Sunset Park in Las Vegas. Tanner, who was 15-years-old, was killed by police while threatening his mother with a knife.