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Diana Theisen holds on to the hand of Westerville Fire Fighter/Paramedic Tuck Blackstone during the ceremony for the unveiling of a piece of steal structure from the World Trade Center at First Responders Park, 374 W. Main St., in Westerville on Monday, September 6, 2010.  The steal piece is labeled C-40 and was part of the vertical structure going from the 98th to 100th floor of the north tower of the World Trade Center. Theisen's son David Theisen died on February 5, 1998 as a result of a house fire in Crooksville, Ohio, where he was a volunteer.