Hilliard was ranked as a five–star recruit and one of the best linebackers in the 2015 class by 247Sports.com coming out of high school.[2] He committed to Ohio State on July 2, 2014.[3] He requested and was approved for a sixth year of eligibility before the 2020 season.[4]
Hilliard was signed as an undrafted free agent by the San Francisco 49ers on May 13, 2021.[8] He was waived on August 31, 2021.[9][10]
New York Giants
On September 1, 2021, Hilliard was claimed off waivers by the New York Giants.[11] He was placed on injured reserve on October 15, 2021.
On June 17, 2022, Hilliard was suspended for the first two games of the 2022 regular season for violating the NFL's policy on performance-enhancing substances.[12] On July 28, 2022, Hilliard was waived.[13]
Kansas City Chiefs
On December 28, 2022, Hilliard was signed to the Kansas City Chiefs practice squad.[14] Hilliard was waived by the Chiefs on January 6, 2023, after Matthew Wright was signed to the practice squad.[15]