Beau Biden | 1969 — 2015

Vice presidential nominee Sen. Joe Biden and his son Beau at the 2008 Democratic National Convention in Denver.

Then vice presidential candidate Joe Biden hugs his son Beau on stage at the 2008 Democratic National Convention in Denver.

Vice President Joe Biden speaks with his son, U.S. Army Capt. Beau Biden, at Camp Victory on the outskirts of Baghdad in July 2009.

Joe Biden, then a vice presidential candidate, is seen with his son, Delaware Atty. Gen. Beau Biden, at the 2008 Democratic National Convention in Denver.

Delaware attorney general candidate Beau Biden holds his son, Hunter, as he walks with his wife, Hallie, holding their daughter, Natalie, as they enter a polling place in Wilmington, Del., in November 2006.

Four-year-old Beau Biden, foreground, plays near his father, center, as he is sworn in as a U.S. senator from Delaware by Senate Secretary Frank Valeo in 1973. Beau was injured in an accident that killed his mother and sister in December 1972. Mrs. Biden’s father, Robert Hunter, holds the Bible.