T.J. Wall, 7, left, and Daniel Wall, 9, on Sunday placed bells at an angel sculpture built to honor Christina-Taylor Green at James D. Kriegh Park in Oro Valley, Ariz. Daniel played baseball with Christina-Taylor, who died during the Jan. 8, 2011, shooting in Tucson. The memorial has Christina-Taylor’s birthdate, Sept. 11, 2001, and was made using a 5 ½-foot-long fragment of an I-beam from ground zero in New York, a 3 ½-foot-long piece of steel from the Pentagon and a large rock from the crash site of United Airlines Flight 93 in Pennsylvania.

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