[2] Walker joined Nebraska University in 2005 but left the school after one season, citing his desire to play in a more up-tempo offense.

[3] He played for Indian Hills during the 2006–2007 season[4] before finishing his college career with Colorado State in 2009.

[17][18] Walker came out of retirement in October 2017 when he joined KR's B-team to play with them in the Final 16 round of the Icelandic Basketball Cup.

[21] On April 14, it was announced that Walker had been called up to KR's A-team for the rest of the 2018 Úrvalsdeild playoffs due to injuries to Jón Arnór Stefánsson.

[18] On April 28, Walker won his second Icelandic championship after KR defeated Tindastóll in the Úrvalsdeild finals.