Dee ihe na-esote paragraf a - Walker buru ụzọ zọọ asọmpi maka Gibraltar na 2000 IAAF World Cross Country Championships
na Vilamoura, Portugal ebe ọ nọrọ na 158th na agba ndị okenye n'oge nke 46:48 wee mechie 149th na agba dị mkpirikpi nke ụmụ nwoke n'oge nke 14:15. N'afọ na-eso ya na 2001 Island Games na Isle nke Mmadụ, Walker kwụsịrị nke anọ na ụmụ nwoke triathlon na oge 2:06:30. N'otu nzukọ ahụ, Walker dekwara oge kachasị mma na oge ndekọ mba nke 10:34.95 na njedebe nke 3000 m steeplechase. N'ọnwa Julaị afọ 2002, Walker mere nke mbụ ya n'egwuregwu Commonwealth site n'ịsọ mpi n'egwuregwu triathlon ụmụ nwoke na 2002 Manchester Games. Ọ gbara ọsọ ahụ na 2:06:15.19 wee nọrọ na 26th. Ọnwa atọ ka nke ahụ gasịrị, Walker sonyere n'asọmpi Ironman World Championship nke 2002 na Hawaii. O mechara 160th n'ime 280 na 35<unk>39 afọ nkewa na 767th n'ime 1605 n'ozuzu ya na oge nke 11:22:55. N'egwuregwu Island nke 2003 na Guernsey, Walker meriri ọla ọcha na triathlon nke ụmụ nwoke na n'akụkụ Harvey Gurry na Anthony Perera kwụsịrị nke isii na egwuregwu egwuregwu.