NBC News chief Richard Engel says his 6-year-old son Henry has died.

Henry, the son of NBC News chief Richard Engel, died Thursday at the age of 6.

Henry was battling Rett syndrome (a genetic brain disorder without any treatment or cure).

According to the National Institute of Neurological Disorders and Stroke, Rett syndrome can cause loss of use of the hands, problems walking, seizures, slow brain and head development, and intellectual disability.

Henry was born on September 29, 2015. He was slow to reach some developmental milestones as an infant.

The Engel family brought Henry to the hospital in 2018.

Richard Engel is an American journalist and chief foreign correspondent for NBC News. 

Engel is best known for covering the Iraq War, the Arab Spring, and the Syrian Civil War.