Collier grew up in his father's hometown of Munday, Texas. He attended Munday High School, where he helped lead the Moguls to a state championship as a junior in 2012.[1] He recorded six tackles, a sack, a forced fumble, and a touchdown on an interception return to earn Defensive MVP honors for the game.[2]
Collier redshirted during his first season at TCU, but became a starter for the Horned Frogs as a redshirt freshman in 2015 despite appearing in just one game. He played in all 13 games for the Horned Frogs as sophomore, recording 4.5 sacks and blocking a field goal against Georgia in the 2016 Liberty Bowl.[4] He recorded 4.5 sacks again as a junior, including one in a crucial late-game situation in the Frogs' comeback win over Stanford in the 2017 Alamo Bowl.[5]
As a senior in 2018, Collier finally got the opportunity to become a starter for the Horned Frogs. He responded by tallying 6.0 sacks, 11.5 tackles for loss and 4 pass break-ups to earn First-team All-Big 12 Conference honors[6] and closed out his collegiate career with a sack in TCU's Cheez-It Bowl victory over California.[7]
Following his senior season, Collier graduated from TCU and was invited to participate in the 2019 Senior Bowl,[8] in which he recorded a sack and a forced fumble.[9]
Collier was selected by the Seattle Seahawks in the first round (29th overall) of the 2019 NFL Draft.[12] The Seahawks traded Frank Clark to the Kansas City Chiefs in order to obtain the selection used to select Collier.[13] After suffering multiple injuries, he finished the season with 3 tackles.
The Seahawks declined the fifth-year option on Collier's rookie contract making him a free agent after the 2022 season.[16] Collier was placed on injured reserve to start the 2022 season.[17] He was activated on October 26, 2022.[18]
Arizona Cardinals
On March 21, 2023, Collier signed a one-year contract with the Arizona Cardinals.[19] He was placed on injured reserve on September 16, 2023.[20]
On March 8, 2024, Collier signed a one-year contract extension with the Cardinals.[21]