Thomas D. Odell ’04-’05, who lived in J-entryway with Fonseca, said Fonseca dropped by his room around midnight on Saturday to have a couple drinks and make casual conversation.

“I noticed nothing out of the ordinary at all,” Odell said. “I got the impression that he had things under control.”

Fonseca was active in Harvard-Radcliffe Television (HRTV), serving as vice president of the executive board and as a director of HRTV’s soap opera, “Ivory Tower.”

HRTV president Debra T. Mao ’05 said the news of Fonseca’s death came as “a shock.”

“None of us thought he was troubled,” Mao said. “In general, he wasn’t a depressed person.”

Friends described Fonseca as easygoing and friendly, and several remembered his witty, sarcastic sense of humor.

An apparent enthusiast for his home state, Fonseca listed Oklahoma and the Oklahoma Sooners among his interests on his entry at thefacebook.com.

According to the entry, which was taken off the site yesterday afternoon by site creator Mark E. Zuckerberg ’06, Fonseca liked hip-hop music and his favorite books were Ayn Rand’s Atlas Shrugged and Mario Puzo’s Fool’s Die.

Odell, who also lived in the same first-year Grays entryway as Fonseca, said Fonseca was outgoing and often passed from table to table during meals in Winthrop dining hall to visit with different groups of friends.

Lisa H. Feigenbaum ’04, who went to several formals with Fonseca, described him as “not superficial, he was interesting to talk to.”

She added that “he was very self-confident in the way he talked about himself—you could even say, cocky.”

Feigenbaum recalled that after a Dunster House formal, her ID got taken at the door of an after-party at the Roxy, but Fonseca was able to bargain with the bouncer to get her into the club.

But Feigenbaum said that at times, Fonseca could also be reserved, particularly about personal issues.

“He held a lot of stuff back, he wasn’t very open about a lot of things,” she said. “He would selectively have short responses to certain types of questions, he was sort of evasive about certain questions. He would joke things off rather than giving you a straightforward answer.”

Fonseca returned to school this fall after taking the 2002-2003 academic year off, but several friends said they did not know why he left or what he did during his time off.