The former Rutgers student who cut a deal in the Tyler Clementi suicide case testified Tuesday that she “felt bad” about spying on his dorm-room tryst with another man.

Under cross-examination, Molly Wei also said she was “overwhelmed with emotions” when cops told her Clementi had probably killed himself.

Wei is the star prosecution witness in the trail of Dharun Ravi, who is accused of invading Clementi's privacy by recording the Rutgers University freshman in the dorm room they shared in 2010. The 19-year-old has known Ravi since middle school and it was in her room that the two watched Clementi with his male companion.

Wei's testimony was the first mention of Clementi's suicide at the trial since the prosecutor's opening statement. The prosecution has made the case about the 15 charges Ravi faces for the secret video recording, not about whether those actions drove Clementi to jump off the George Washington Bridge.

"I think that he thought we were going to get in trouble, so he wanted to make it seem like it was more of an accident," Rutgers New Jersey State University student Molly Wei testified in a New Jersey court on Monday.

Wei took the witness stand to testify against Ravi, 19, who is accused of activating a webcam to spy on his roommate, Tyler Clementi, 18, just days before Clementi killed himself by jumping off the George Washington Bridge.

Both Wei and Ravi viewed the images on Wei's computer. Wei, who was originally charged with two counts of invasion of privacy, entered a pre-trial intervention programme that required her to perform 300 hours of community service in exchange for the charges being dropped.

Wei said they watched for "about two seconds" before turning the image off.

Ravi texted her multiple times when she was being interviewed by police about the alleged spying, asking her what exactly she was confessing to investigators, she said.

"Did you tell them we did it on purpose? What did you tell them when they asked why we turned it on? I said we were just messing around with the camera," Ravi said in messages.

Ravi is charged with witness tampering for the messages he sent to Wei, in addition to invasion of privacy, bias intimidation, and hindering arrest.

On cross-examination, Wei said Ravi wanted to peek into the room because Clementi's date was an older man and did not appear to be a Rutgers student. She told the court that Ravi feared that the man would steal his iPad.

Altman is expected to argue that Ravi is not guilty of invasion of privacy because he did not record and replay the images of Clementi.

Prosecutors could argue that the live-streaming of the footage from the webcam constitutes broadcasting.

Altman quizzed Wei repeatedly about her decision to make a deal with prosecutors in order to avoid jail time.

The agreement calls for her to "cooperate with law enforcement and [provide\] truthful testimony at a trial against co-defendant Dharun Ravi" and complete 300 hours of community service.

Wei has not spoken to Ravi since Sept. 23, 2010, and she did not return to Rutgers.