[1] McCormick turned professional in 2014 with the Binghamton Senators of the American Hockey League (AHL).

McCormick made his NHL debut on October 25, 2015 with Ottawa in a 4–1 defeat to the Arizona Coyotes.

He was immediately assigned to the team's American League affiliate, the Colorado Eagles.

[4] In the following 2019–20 season, upon returning from injury, McCormick was assigned to the Charlotte Checkers, Carolina's AHL affiliate.

McCormick collected 16 goals and 35 points in 56 games before the remainder of the season was cancelled due to the COVID-19 pandemic.