[5] On September 30, 2008, Walker signed with the Phoenix RoadRunners of the ECHL, but was soon after waived by the team and claimed off of waivers by the Ontario Reign on October 14, 2008.

[6][4] During the 2009–10 season, Walker split his time between the Manchester Monarchs of the American Hockey League (AHL) and their ECHL affiliate, the Ontario Reign.

[15] After completing the season with the Mavericks, Walker signed his first contract abroad, agreeing to a one-year deal with DEL2 club, Löwen Frankfurt on June 15, 2015.

[19] In the lead up to the pre-season, Walker sought and was released from his agreement with Tingsryds opting to move initially to Italian club, HC Fassa of the newly formed Alps Hockey League to begin the 2016–17 season.

Walker played 33 games with Fassa in accruing 56 points before leaving the club to in February 2017 to join UK team Sheffield Steelers of the Elite Ice Hockey League.

[22] During the 2017–18 season, in November 2017, Walker moved back to the EIHL to sign for Guildford Flames to complete his ten-year professional career.