Konplete fraz sa a: Walman te jwe Hockey junior ak Toronto Jr. Canadiens nan Ontario Junior Hockey League (OJHL) anvan li te komèt nan Hockey kolèj ak Providence College nan Hockey East la. Anvan sezon premye ane li ak Friars yo, Walman te chwazi nan
2014 NHL Entry Draft nan twazyèm tou, 82nd an jeneral, pa St Louis Blues.