(Patrick Semansky | AP file photo) In this June 6, 2015, photo, then-Vice President Joe Biden watches an honor guard carry a casket containing the remains of his son, former Delaware Attorney General Beau Biden, into St. Anthony of Padua Roman Catholic Church in Wilmington, Del. Standing alongside the vice president are Beau's widow Hallie Biden, left, and daughter, Natalie. Beau Biden died of brain cancer May 30. 2015, at age 46.