Lou Holtz, the last coach to lead Notre Dame to a national championship, died on Wednesday at 89 years old.

Upon the news of his death, tributes to the College Football Hall of Famer surfaced on social media from his former teams, colleagues and his son, Skip Holtz.

Skip Holtz played for a season under his father as a walk-on at Notre Dame in 1986. He later coached under his father as an assistant for the Fighting Irish and again at South Carolina before working as a head coach at East Carolina, South Florida and Louisiana Tech.

Skip confirmed his father’s death on Wednesday, touting him as “successful” and “significant.”

Current Notre Dame head coach Marcus Freeman issued a statement honoring his predecessor, of whom he wrote “welcomed me to the Notre Dame family immediately.”

“Lou’s impact at Notre Dame has gone well beyond the football field,” Freeman wrote. “He and his wife, Beth, are respected across campus for their generous hearts and commitment to carrying out Notre Dame’s mission of being a force for good.”

In addition to announcing Holtz’s death via a statement from his family, Notre Dame issued a video tribute to its late former coach on social media.

NC State, Minnesota, South Carolina and a New York Jets team for which Holtz coached a single season in 1976 also paid tribute to their late former coach.

Holtz went on to work as a broadcaster for CBS Sports and ESPN following his coaching career. His former ESPN colleague, Mike Greenberg, shared a story about some advice Holtz gave him when Greenberg and his wife were expecting their first child together.

“RIP Coach, thanks for the best advice anyone ever gave me,” Greenberg wrote.