 Pari gbolohun ti o tẹle: Killen ṣe ifilọlẹ agbaye rẹ fun New Zealand lakoko 2000 OFC Nations Cup, ati pe o wa ninu ẹgbẹ New Zealand U23 fun ifarahan wọn ni Awọn ere Olimpiiki Igba Irẹdanu Ewe 2008 bi ọkan ninu awọn oṣere mẹta ti o ju ọjọ ori lọ. O tun jẹ orukọ gẹgẹbi apakan ti ẹgbẹ agbabọọlu New Zealand fun 2002 OFC Nations Cup, : 2003 àti 2009 FIFA Confederations Cup, àti 2010 FIFA World Cup. 