Tulis hiji tuluyan pikeun paragraf ieu - Demko meunang medali pérak salaku anggota timnas AS di handapeun-18 di 2013 IIHF Dunya U18 Championship. Manéhna ogé anggota timnas junior AS dina 2014 IIHF World Junior Championship
, sarta mangrupa cadangan ka sasama Goalkeeper Hockey East Jon Gillies of Providence.