Joseph Robinette "Beau" Biden III (February 3, 1969 – May 30, 2015) was an American politician, lawyer, and officer in the Army Judge Advocate General's Corps from Wilmington, Delaware. The oldest child of current U.S. president Joe Biden and Neilia Hunter Biden, he served as the 44th attorney general of Delaware from 2007 to 2015 and was a major in the Delaware Army National Guard in the Iraq War. He died of brain cancer in 2015 at the age of 46.