There are multiple descriptions of Deck's death:
"Our casualties were heavy. John Deck, one of the finest men in the battalion who took command when Bryce Coleman was killed said tersely, 'We're going over together boys. Remember, Mackenzie-Papineau, over the top.' With a whoop he jumped over the parapet leading the attack. He was hit and yelled 'Don't mind me, keep on going, keep on going.'" (HC 18)
"Deck fell on July 9, in the attack on Mosquito Ridge. He was dashing forward at the head of the men, waving his rifle in the air, when he was hit by a bullet and died a few moments afterwards." (Book of the XV Brigade 148-50).
Hello Canada; Book of the XV Brigade; RGASPI Fond 545, Opis 6, Delo 546, ll. 26-27; List of Canadian Casualties in Spain MG30 E173 Vol.1 File 13; Americans and Canadians Killed in Spain Complete list to Nov. 15, 1937; Hoar, p94, p99; Momryk; Petrou; Hoff