Pedzisa mutsara unotevera: Mukutanga kwema1970, Walker akapinda paUniversity of Oregon kwaakadzidziswa naSteve Prefontaine ane mukurumbira. Pashure porufu rwaPrefontaine, iye aigara mumusha wake neshamwari yake nomunun'una wake. Walker akamiririra United States mu1972 International Cross Country Championships, kwaakaisa 9th kuhwina sirivha nechikwata cheUS, uye iyo
1973 IAAF World Cross Country Championships, kuhwina bronze nechikwata nechinzvimbo che30th, uye aive All-American mu cross country muna 1973. Kubva muna 1972 kusvika muna 1978, akakunda Oregon Road Runners Club vakadzi aquathlon, biathlon inosanganisira kumhanya uye kushambira, kasere akateedzana. Muna 1981, Walker akadzokera kukoreji kuOregon State University kwaakadzidziswa kwenguva pfupi naJoe Fulton. Ikoko aizoisa zvinyorwa zvechikoro mumamita 5 000 uye 10 000. Walker akanga ariwo shasha yeOregon state triathlon muna 1984, 1986, uye 1987. Kukuvadzwa uye mararamiro ake okurovedza kumhanya nyika yose zvakamutadzisa kumhanya imwe marathon. Nokuda kwezvaakaita, Walker akaiswa muPortland Interscholastic League's Hall of Fame muna 2005.