In Casey's first season in 2019, he totaled five tackles (1.5 for a loss) and a sack. In 2020, Casey had 15 tackles (three for a loss) and a sack. In 2021, Casey finished the season with 25 tackles and one tackle for a loss. Casey took a step up in 2022, becoming a full time starter where he recorded 86 tackles (10.5 for a loss), one and a half sacks, and two forced fumbles. In the 2023 preseason, Casey was named to the
Butkus Award watch list. In week one of the 2023 season, Casey notched 11 tackles with one being for a loss against
Ohio State. In week ten, Casey had a career performance totaling nine tackles (four for a loss) and two sacks versus
Wisconsin. In Indiana's 2023 season finale, Casey tallied 11 tackles (four for a loss) and a sack, but the Hoosiers lost to
Purdue. ==Professional career==