May 28, 2008, file photo: Space shuttle Discovery commander Mark Kelly, right, gestures as he walks with his twin brother astronaut Scott Kelly, left, and mission specialist Ron Garan, after arrival at Kennedy Space Center in Cape Canaveral, Fla. Terry Renna/AP hide caption

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Terry Renna/AP

Mark Kelly, husband of Rep. Gabrielle Giffords (D-AZ), as he spoke to reporters at the University Medical Center in Tucson, Ariz., earlier today (Jan. 20, 2011). John Moore/Getty Images hide caption

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John Moore/Getty Images

Mark Kelly, speaking about his wife; Jan. 20, 2011

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A makeshift memorial outside the University Medical Center in Tucson includes candles and this photo of Rep. Gabrielle Giffords with supporters. John Moore/Getty Images hide caption

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John Moore/Getty Images

Mark Kelly, husband of Rep. Gabrielle Giffords (D-AZ) on ABC-TV's 20/20. abcnews.go.com hide caption

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Mark Kelly holding the hand of his wife, Rep. Gabrielle Giffords, in her room at University Medical Center in Tucson on Sunday, Jan. 9, 2010. Office of Rep. Gabrielle Giffords/AP hide caption

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Office of Rep. Gabrielle Giffords/AP