EAST LANSING — After 13 seasons and 114 victories, Michigan State football coach Mark Dantonio announced his retirement Tuesday afternoon, one day before National Signing Day.

Dantonio resurrected a Spartan program and turned it into a champion. Michigan State won Big Ten Conference titles in 2010, 2013 and 2015. Michigan State also won a Rose Bowl title and played in the College Football Playoff national semifinals.

In his letter of resignation, Dantonio thanks fans, alumni and the Michigan State University administration for their support over the years, as well as his players and coaches.

“Today marks one of the most difficult decisions that I have ever made here at Michigan State,” Dantonio said in his letter. “Every February since 2007, I have reset this program in preparation for the next year’s challenges. After much reflection and discussion with my family, I feel that it is now time for change as we enter into a new decade of Michigan State football.”

Dantonio posted a record of 114-57 at Michigan State. He took over the Spartans’ program after a successful stint at the University of Cincinnati. Michigan State had six 10-wins seasons under his direction, but the Spartans had struggled the past few seasons, including a 7-6 campaign the past two years.

Dantonio recently received a $4.3 million longevity bonus from Michigan State.

Michigan State defensive coordinator and linebackers coach Mike Tressel will serve as the interim coach.

Information on the status about the future of the assistant coaches, including Dowagiac’s Mark Staten, who serves as the Spartans’ tight ends coach and special teams coordinator, has not been released. Dantonio was scheduled to have a press conference prior to the Michigan State basketball game Tuesday night.

Attempts to reach Staten for comment were unsuccessful as of Tuesday afternoon.

Dantonio’s announcement comes one day after former Michigan State recruiting director Curtis Blackwell filed claims that Dantonio committed NCAA recruiting violations as part of a lawsuit for unlawful termination. Dantonio is expected to be a witness in the lawsuit.

As for his future?

“My plan is to stay on within the university and athletic department in a role involving special projects, especially transitioning our players, both current and incoming, to their next challenges,” Dantonio said. “It has truly been an honor and a privilege to serve as head football coach at Michigan State University. I will forever be a Spartan.”