ATLANTIC CITY, N.J. -- Baltimore Ravens running back Ray Rice has been indicted on a charge he assaulted his fiancee during an argument in an elevator at an Atlantic City, N.J., casino last month.

Rice had been charged with simple assault after police said he knocked out Janay Palmer on Feb. 15 at the Revel Casino. But a grand jury Thursday indicted him on a more serious count of aggravated assault, which carries a three-to-five-year sentence.

Palmer also had been charged with simple assault. But prosecutors say that complaint was administratively dismissed.

The couple live in the Baltimore suburb of Reistertown.

Palmer's attorney has said he's certain no crime was committed. Rice's attorney, Michael Diamondstein, tells The Press of Atlantic City that Rice "vehemently denies" the charge and that the couple are happy and in counseling.