Bloomington, IN -- (Sports Network) - Indiana athletic director Rick Greenspan announced Thursday that he will resign at the end of the year as the men's basketball program comes under continued criticism for recruiting violations.

"This has been a very difficult time and I am aware that I have become the focus of criticism which will continue to distract Indiana University from its core educational mission. Consequently, I believe a new person will be in a stronger position to lead IU athletics moving forward and it is in IU's best interests for me to stand down," Greenspan said.

The Indiana program was already facing sanctions for five recruiting violations incurred under former head coach Kelvin Sampson before a new infraction was announced on Tuesday. The NCAA announced that a "failure to monitor" allegation joins the others against Indiana athletics.

"Without question, I am extremely disappointed in the new charges brought by the NCAA Committee on Infractions against Indiana University that were released today," said Greenspan. "I disagree with these charges, particularly since the NCAA Enforcement staff did not reach this same conclusion after their original, in-depth investigation. Nevertheless, the new charges must and will be answered."

Sampson was forced to resign in February and Dan Dakich took over on an interim basis as the Hoosiers finished a 25-8 campaign with a loss to Arkansas in the first round of the NCAA Tournament. Former Marquette coach Tom Crean was hired to replace Sampson.

"Our university owes Rick a great debt of gratitude for his selfless service," said Indiana president Michael McRobbie of Greenspan, who has been AD since 2004.

"I am extremely disappointed with this additional allegation by the Committee on Infractions. I believe our compliance program worked, and have remained steadfast since I first learned of this situation in my belief that Rick Greenspan and the compliance staff did their job. We uncovered the violations, perhaps not immediately, but the appropriate behavior was uncovered, reported promptly and investigated thoroughly," said McRobbie.