As a true freshman at Indiana in 2017, Layne appeared in 12 games, including one as a starter, and made 13 tackles while being named the school's "Defensive Newcomer of the Year."[3] The following season, he started seven games, while appearing in all 12, and recorded 39 tackles as well as three pass breakups and a fumble recovery.[3] After starting the first five games of his junior year, Layne was relegated to a backup role in favor of Tiawan Mullen.[3] Despite being a backup, he still managed to post 30 tackles and was named Indiana's special teams player of the year.[1]
Layne missed the entire 2020 season with an injury.[1] He changed his position from cornerback to safety prior to the 2021 season.[4] As a senior that year, he tallied 65 total tackles, one interception, one fumble forced and a pass breakup while starting all 12 matches.[1] He decided to enter the NFL Draft after the season,[5] and finished his college career with 50 career games played, 147 tackles, two forced fumbles and an interception.[1]
After going unselected in the 2022 NFL draft, Layne was signed by the Los Angeles Chargers as an undrafted free agent.[7][8] He was released at the final roster cuts but was subsequently brought back on the practice squad.[9] He was elevated to the active roster for their game against the Arizona Cardinals,[10][11] and made his NFL debut in the game, appearing on nine special teams snaps.[12] He was signed to the active roster on December 26, 2022.[13] He finished the season having played six games while recording two tackles.[12]
On August 15, 2024, Layne signed with the New York Giants.[16] He was waived on August 27, and re-signed to the practice squad.[17][18] He was promoted to the active roster on December 21.