A Twitter post from one of the students accused of streaming the sexual encounter live on the internet indicated Clementi, a renowned high school violinist, was with another man.
"Roommate asked for the room till midnight," read the post from Dharun Ravi, 18. "I went into Molly's room and turned on my webcam. I saw him making out with a dude. Yay."
The Twitter post went up Sept. 19 - three days before Clementi's suicide.
At least two people spotted Clementi standing on the south walk of the bridge near the New York side at 8:50 p.m. The
The Ridgewood, N.J., teen left no note before jumping, the sources said.
The teen's car was parked on the New Jersey side of the bridge.
"We are not talking right now," said the victim's father, Joseph Clementi, 54. "We are still in mourning. It's been a lot to deal with."
The stunning details emerged one day after authorities announced the arrests of Ravi and Molly Wei for cyber-voyeurism.
The pair used the hidden dorm room camera to stream their fellow student's sex session, officials said.
Clementi graduated in June from Ridgewood High School, where he was well-known for his musical prowess. His former classmates became aware of his disappearance late last week, said schools Superintendent Daniel Fishbein.
"We've had counselors available for students and staff for some time," said Fishbein.
Ravi, 18, of Plainsboro, was free Wednesday on $25,000 bail. Co-defendant Wei, 18, of Princeton, was released on her own recognizance after the suspects surrendered to campus police.
The pair, who were high school classmates, were charged with two counts each of invasion of privacy for the Sept. 19 broadcast, said Middlesex County Prosecutor Bruce Kaplan.
Kaplan had no immediate comment about additional charges in the wake of Clementi's death.
Ravi was additionally charged with two more invasion of privacy counts for trying to arrange the airing of a second session on Sept. 21, Kaplan said.
Ravi's lawyer was not available Wednesday for comment.
The top count against each suspect carries a five-year jail term. The two students were on the Piscataway campus less than a month before their arrests.
Ravi pulled down his Twitter account, where he also made a cryptic Sept. 21 reference to his roommate asking to have their room to himself.
"Yes, it's happening again," he wrote.
Rutgers students who knew the duo were shocked by the arrests.
Ravi was a ping-pong player and Frisbee enthusiast, while Wei was described by one friend as a dedicated student from a strict household.
"She studies a lot," said the 17-year-old, who attended West Windsor-Plainsboro High School with the pair. "She gets good grades. She never did anything bad."
Rutgers issued a statement saying it would not comment on any details of the case.
"The university takes these matters seriously and has policies to deal with student behavior," said spokeswoman Sandra Lanman. "Under federal law, the university cannot comment on specifics."