Master Sergeant Stewart was a member of the 19th Infantry Regiment, 24th Infantry Division. He was listed as Missing in Action while fighting the enemy in South Korea on 16 July 1950 and returned to duty on 21 July 1950. He was Killed in Action while fighting the enemy in North Korea on 4 November 1950.

Stewart was awarded the Purple Heart, the Combat Infantryman's Badge, the Korean Service Medal, the United Nations Service Medal, the National Defense Service Medal, the Korean Presidential Unit Citation and the Republic of Korea War Service Medal.