TRENTON, NJ — A former Rutgers University freshman was indicted yesterday on a hate-crime charge for allegedly using a Web cam to spy on a same-sex encounter involving his roommate, who committed suicide shortly afterward.

A 15-count indictment was handed up yesterday by a Middlesex County grand jury against Dharun Ravi, of Plainsboro, who had already faced invasion-of-privacy charges along with another student, Molly Wei, in a case that sparked a national debate on bullying.

The indictment charges Ravi with bias intimidation, invasion of privacy, witness- and evidence-tampering and other charges stemming from the suicide of Tyler Clementi, 18, in September. The indictment said charges against Wei would not be presented to the grand jury “at this time.”

Clementi jumped off the George Washington Bridge into the Hudson River shortly after, authorities say, Ravi and Wei used a Web cam to peek at his homosexual liaison.

Lawyers for Ravi say the Web-cam stream was viewed on only a single computer and did not show the men having sex.

The indictment says Ravi targeted Clementi and invaded his privacy knowing that he would be intimidated because of his sexual orientation.

According to the indictment, Ravi deleted a Twitter post letting others know how they could view a second encounter involving Clementi and replaced it with a false tweet; deleted text messages sent and received by witnesses; and gave false information to police — all actions that were intended to mislead investigators.

If convicted of the most serious bias charge, Ravi could face five to 10 years in prison.

Lawyers for Ravi and Wei didn’t immediately return calls seeking comment.

Clementi, a promising violinist in his first weeks at college, became a face of the issue of bullying.

President Obama and celebrities including talk-show host Ellen DeGeneres and sex columnist Dan Savage have talked publicly about his death.

Clementi’s parents, Jane and Joe Clementi, said in a statement that they were eager for the case to move forward in order to “reinforce the standards of acceptable conduct in our society.”

“The grand-jury indictment spells out cold and calculated acts against our son Tyler by his former college roommate,” they said.

“If these facts are true, as they appear to be, then it is important for our criminal-justice system to establish clear accountability under the law.”