[4] On January 19, 2021, it was announced Halsey would leave college early and sign a Generation Adidas contract, allowing him to enter the 2021 MLS SuperDraft.
[6] Halsey made his professional debut on July 9, 2021, starting for Salt Lake's USL Championship side Real Monarchs in a 3–1 loss to El Paso Locomotive.
[7] On August 9, 2022, Halsey signed on loan with Colorado Springs Switchbacks for the remainder of the USL Championship season.
[10] Following his release from Salt Lake, Halsey signed with MLS Next Pro side FC Cincinnati 2.
[11] He signed a short-term deal to join the FC Cincinnati first team roster on March 24, 2023.