April 1, 2011: A crowd gathers near the angel statue built in memory of shooting victim Christina-Taylor Green in Oro Valley, Ariz.
Christina-Taylor Green, who was born on Sept. 11, 2001. The third-grader -- along with five others -- was shot dead during a meet-and-greet in Arizona with Congresswoman Gabrielle Giffords.
Christina, right, poses in a team photo taken a year ago with her Little League baseball team, where she was the only girl.
April 1, 2011: John and Roxanna Green and their son, Dallas Green, observe the statue built in memory of their daughter and sister, Christina-Taylor.
A girl sits next to a piece of twisted steel taken from the remains of the Twin Towers that sits at the angel statue's feet.
March 23, 2011: Gary Goldberg, with Hulk Rigging and Hauling, watches as a 5 1/2-foot-long fragment of an I-beam, salvaged from the World Trade Center, is lifted to the bed of a truck at New York's John F. Kennedy International Airport. It was later molded into the angel memorial honoring Christina-Taylor Green.
April 1, 2011: A patch given to Little League players that shows the Twin Towers and Christina-Taylor's initials, birth and death dates.
A statue of an angel now stands watch over a Little League ballpark in Oro Valley, Ariz. where 9-year-old Christina-Taylor Green, born on 9/11 and killed in the Jan. 8 Tucson shootings, was once the only girl on her baseball team.