Boston Celtics assistant coach Jerome Allen has entered a guilty plea to a bribery charge dating back to his time as a college coach.He was accused of, in 2014, accepting $18,000 from the father of a prospective student who wanted Allen to use his “position as coach to help his son get admitted to the school as a ‘listed’ recruit,” Allen said in a statement issued through his attorney after pleading guilty in U.S. District Court for the Southern District of Florida.As part of a plea agreement, Allen must repay the $18,000 and pay a $200,000 fine. He is expected to be suspended but remain on coach Brad Stevens’ staff.He joined the Celtics in 2015.”I failed on many levels,” Allen, 45, said in the statement. “Primarily, I had a failure of character. I did not live up to the high standards I set for myself, or were expected of me in the position that I held.”I am heartbroken that my players — current and former — will know that I broke the law. But, I do hope that some good may come out of this. I wish to model to my young players how one accepts responsibility for wrongdoing, including the consequences that come from unlawful behavior.”Team president Danny Ainge said he respects how Allen has handled the situation.