Question: When did John Poindexter's son die?

Context paragraphs:
Alan G. Poindexter: Alan Goodwin "Dex" Poindexter (November 5, 1961 – July 1, 2012) was an American naval officer and a NASA astronaut.  Poindexter was selected in the 1998 NASA Group (G17) and went into orbit aboard Space Shuttle Missions STS-122, and STS-131

John Poindexter: John Marlan Poindexter (born August 12, 1936) is a retired United States naval officer and Department of Defense official.  He was Deputy National Security Advisor and National Security Advisor for the Reagan administration.  He was convicted in April 1990 of multiple felonies as a result of his actions in the Iran–Contra affair, but his convictions were reversed on appeal in 1991.  More recently, he served a brief stint as the director of the DARPA Information Awareness Office for the George W. Bush administration.  He is the father of NASA astronaut and U.S. Navy Captain Alan G. Poindexter.

Die Hard with a Vengeance: Die Hard with a Vengeance is a 1995 American action film and the third in the "Die Hard" film series.  It was co-produced and directed by John McTiernan (who directed "Die Hard"), written by Jonathan Hensleigh, and stars Bruce Willis as New York City Police Department Lieutenant John McClane, Samuel L. Jackson as McClane's reluctant partner Zeus Carver, and Jeremy Irons as Simon Gruber.  It was released on May 19, 1995, five years after "Die Hard 2", becoming the highest-grossing film at the worldwide box-office that year, but received mixed reviews.  It was followed by "Live Free or Die Hard" and "A Good Day to Die Hard" in 2007 and 2013, respectively.

The Nightingale's Song: The Nightingale's Song is a 1995 book by "Baltimore Sun" journalist Robert Timberg.  It relates the military and political careers of five graduates of the United States Naval Academy, most of whom served during the Vietnam War in either the United States Navy or United States Marine Corps: John McCain, Bud McFarlane, Oliver North, John Poindexter, and Jim Webb.  Timberg himself was also a Naval Academy graduate and served in Vietnam with the Marine Corps, where he was badly wounded.

John A. Poindexter: John A. Poindexter (October 12, 1825 – April 14, 1869) was a colonel in the Confederate Army during the American Civil War.  He and Joseph C. Porter were the primary recruiting commanders in northern Missouri during 1862.

Odon Guitar: Odon Guitar (August 31, 1825 – March 13, 1908) was a general in the Union Missouri State Militia during the American Civil War.  He was noted for his successful campaign against Joseph C. Porter and John A. Poindexter's recruiting commands in northern Missouri.

John B. Poindexter: John B. Poindexter is an American businessman and former soldier.  He is the Chairman of the Board and Chief Executive Officer of J.B. Poindexter & Co., Inc. and owner of Cibolo Creek Ranch.

Rice/Poindexter case: David Rice (1947 – March 11, 2016) (also known as Mondo we Langa) and Edward Poindexter were charged and convicted of the murder of Omaha Police Officer Larry Minard.  Minard died when a suitcase bomb containing dynamite exploded in a North Omaha home on August 17, 1970.  Officer John Tess was also injured in the explosion.  Rice died on March 11, 2016.  He was 68 years old and had been in poor health.

Holt-Poindexter Store Building: The Holt-Poindexter Store Building is a historic retail building in rural Ouachita County, Arkansas.  It is located on County Road 101, near its southern junction with County Road 111, about 4 mi north of Stephens, in the unincorporated community of Ogemaw.  The store, a vernacular single-story wood frame structure with a gable roof and full-width front porch, was built in 1904 by H. B. Holt, and is believed to be the oldest general store in southern Arkansas.  A small addition was added to the north side in the 1920s to house post office facilities.  This was removed in 1948, at which time a rear addition was added to provide space for an office and feed storage.  The business was taken over by Holt's son-in-law, Chester Poindexter, and then his son, Kenneth.

Harry Poindexter: Harry Clay Poindexter (born May 10, 1857) was mayor of Jeffersonville, Indiana, United States, and son of former Jeffersonville mayor Gabriel Poindexter.

Supporting paragraphs: John Poindexter Alan G. Poindexter
Answer: July 1, 2012