Kara Kennedy Allen, the daughter of late Senator Ted Kennedy, dies, aged 51.<br/> She was at this Washington DC health club Friday night when, according to her brother Patrick, her heart gave out.<br/> The mother of two was diagnosed with lung cancer in 2002, but had been in remission.<br/> She accepted the Presdiential Medal of Freedom on her father's behalf shortly before he died of brain cancer in 2009.<br/> Kennedy, a filmmaker and TV producer, served on the boards of several nonprofit organizations and kept a low-profile as an adult.<br/> Lindsey Parietti, Reuters
