Hagai, son of Shlomo and Devorah Gilboa, was born in 1941 in Tel Aviv. He was drafted into the Israel Defense Forces in August 1960 and joined the Israel Air Force. After serving in the career army he served as a pilot and was promoted to lieutenant. On 18 Iyar (29.4.1964) he fell in the line of duty and was brought to eternal rest in the military cemetery in Kiryat Shaul.