This undated handout photo provided by the Legg family shows Christopher Legg. 

This undated handout photo provided by the Legg family shows Christopher Legg. Christopher was killed when a tornado struck Plaza Towers Elementary School in Moore, Okla., on May 20, 2013. (AP Photo/Courtesy of the Legg Family)
Associated Press
This undated handout photo provided by the Legg family shows Christopher Legg. Christopher was killed when a tornado struck Plaza Towers Elementary School in Moore, Okla., on May 20, 2013. (AP Photo/Courtesy of the Legg Family)
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