In the NBL1 West, Walker is a two-time league MVP and a championship winner in 2022 with the Rockingham Flames.

[5] In May 2010, Walker signed a National Letter of Intent to play college basketball for Northwestern Oklahoma State University in the 2010–11 season.

He scored in double digits in 11 contests, including a career-best 24 points in the regular season finale against Angelo State on February 25, 2012.

He posted 13 double figure point totals on the year, highlighted by his 20-point performance against Southern Arkansas on November 26, 2012.

He finished the season ranked in the top 10 in the league with 13.6 points per game and led the LSC with a 91.3-percent mark from the foul stripe.

[6] On June 5, 2014, he was named the recipient of the 2013–14 Lone Star Conference Scholar-Athlete Award for A&M-Commerce.

[5] Five of his six 20-point games with Delaware came after December, including a career-high 24 points in a 131–125 loss to the Maine Red Claws on February 4.

[8] In his third season, Walker appeared in 48 games (38 with Delaware, 10 with Westchester), averaging 12.0 points, 2.8 rebounds and 1.3 assists.

[20] Walker returned to the Delaware 87ers in March 2018,[21] but he did not play for the 87ers to finish the 2017–18 NBA G League season.

[23] On July 31, 2018, Walker signed with Italian team Pallacanestro Trieste for the 2018–19 LBA season.

[25] On December 12, 2019, Walker signed with French team Chorale Roanne Basket of the LNB Pro A.

[28] On January 14, 2020, Walker signed with the South East Melbourne Phoenix for the rest of the 2019–20 NBL season, returning to Australia for a second stint.

[46] The Flames went on to lose 97–94 in overtime to the Joondalup Wolves in the preliminary final, with Walker scoring a game-high 32 points on 11-of-32 shooting and 4-of-20 from 3-point range.

[49] In December 2023, Walker signed with the Borneo Hornbills of the Indonesian Basketball League (IBL) for the 2024 season.

[51] He was replaced on the roster by Steve Taylor, Jr.[52] He had been recovering from a meniscus injury and then suffered a torn tendon in his thigh.

[57] The Flames finished seventh in the regular season and beat the sixth-seeded East Perth Eagles in the elimination final, winning 104–81 behind Walker's 38 points.

[62] Walker worked as a volunteer skills coach with the Perth Lynx during the 2023–24 WNBL season.