WASHINGTON — Former Rep. Patrick Kennedy said his sister, Kara, the oldest child of the late Sen. Edward Kennedy, has died.

Kara Kennedy was 51.

Patrick Kennedy, a former congressman from Rhode Island, said his sister died Friday while at a Washington-area health club.

Kara Kennedy, the oldest of three children, was a lung cancer survivor. Doctors removed a malignant tumor in 2003.

Patrick Kennedy told The Associated Press that “she’s with Dad.” Their father died in 2009.

Patrick Kennedy said he thinks his sister’s cancer treatment “took quite a toll on her and weakened her physically.” He said “her heart gave out.”

He also said his sister loved to exercise.