Education
Day attended Warren Central High School in Indianapolis, Indiana.
Day attended Warren Central High School in Indianapolis, Indiana.
Considered a four-star recruit by Rivals.com, he was rated as the 18th best defensive tackle prospect of his class. On August 4, 2011, he committed to play college football at the University of Notre Dame. As a true freshman at Notre Dame in 2012, Day appeared in all 13 games and had 23 tackles and two sacks.
As a sophomore, he played in 11 games and made eight starts.
He recorded 33 tackles and a half sack. As an 11-game starter his junior year, Day had 40 tackles and one sack.
Following the end of the season, Sheldon Day announced that he would return for his senior season, foregoing the 2015 NFL Draft. In his senior season, starting all 13 games, Day set a career high in tackles (45), tackles for loss (155) and sacks (4), earning himself second-team All-American honors by the Associated Press.