Stills played in 21 total games his first two years at West Virginia, recording 13 tackles and one sack.[3][4] He became a starter his junior year in 2019 and recorded 46 tackles and seven sacks.[5] Prior to his senior season, Stills was selected the Big 12 Preseason Defensive Player of the Year.[6]
Stills signed with the Las Vegas Raiders as an undrafted free agent on May 7, 2021.[9] He was waived/injured on August 24, 2021, and placed on injured reserve.[10] He was released on August 26.
Kansas City Chiefs
On January 11, 2022, Stills signed a reserve/future contract with the Kansas City Chiefs.[11] He was waived on May 10, 2022.[12]
Birmingham Stallions
Stills signed with the Birmingham Stallions of the USFL on November 22, 2022.[13] On March 27, 2023, Stills was released by the Stallions.[14]
Several of Stills family members played in the NFL and Division I football. His brother Dante played alongside him at West Virginia and now plays defensive line for the Arizona Cardinals.[17] Their father, Gary, played in the NFL for 10 years and also played for the Chiefs.[18] Stills uncle, Ken, and cousin, Kenny also played in the NFL.