NEW HAVEN, Connecticut (CNN)  -- A quiet rendition of "Amazing Grace" capped an emotional candlelight vigil Monday night for slain Yale University student Annie Le, whose body was found on what was to have been her wedding day.



Students at Yale attend a candlelight vigil for Annie Le Monday night.



Several hundred people turned out on the Yale campus for the vigil, crying and hugging each other. Le's roommate, Natalie Powers, said the 24-year-old graduate student in pharmacology "was as good a human being as you'd ever hope to meet."



"She was also really tenacious and had a sense of humor that was never far away, and she was tougher than you'd think by just looking at her," Powers said.



"That this horrible tragedy happened at all is incomprehensible. But that it happened to her I think is infinitely more so. It seems completely senseless."



Connecticut state medical examiners announced Monday that the body found in a Yale medical research building over the weekend was that of Le, who had been missing for nearly a week. Her body was found Sunday hidden in a basement wall. Bloody clothes were found hidden above tiles in a drop ceiling elsewhere in the same building, investigators said.



Le was last seen entering the building Tuesday morning.



Thomas Kaplan, editor-in-chief of the Yale Daily News, said Le "really had everything going for her."



"She was a top scholar. She was very outgoing, a warm person," Kaplan said. "You know, she was diminutive in stature, but certainly not in personality. And that's what I think just makes this so sad for everyone, regardless of whether you knew her. It's just a tragedy."



Le's death is being investigated as a homicide, but Connecticut medical examiners released no further information beyond the identification.



A candlelight vigil in her honor was scheduled for Monday evening on the campus.



A Yale professor said on Monday that the building has good security and only certain people can enter, let alone access certain areas. Professor Gary Rudnick, who interviewed Le when she applied for admission to the graduate program in pharmacology, said it gives him the sense that there could be a "murderer among us."



No suspects are in custody, but investigators are questioning several people in the case, New Haven Police spokesman Joe Avery said.  Watch a report about the case »



Kaplan said Le's killing has left Yale students shocked and wary. "Only Yalies had access to that basement, and that seems to point to someone in our community being involved in this," Kaplan said. "That's what is so frightening."



Authorities have not described the clothes that were found, nor said to whom they may have belonged. Teams of investigators at a Connecticut State Police lab worked through the weekend processing and examining the blood-stained clothes.



Kaplan said a Yale police official told the newspaper the clothes were not what Le was wearing when she entered the building.



At a meeting Monday for members of the campus community, Yale officials discussed security and provided an update on the investigation. A faculty member and a student who attended the meeting told CNN that Yale officials said police have narrowed down suspects.



Security cameras captured video of Le as she entered the four-story lab building at 10 Amistad Street, about 10 blocks from the main campus, six days ago. After poring over hours of surveillance tapes, authorities said they had not found images of her leaving the building.



Rudnick described security in the building as "very good." It had restricted access, and simply having a Yale ID card was not enough to get in, he said. Within the building, one had to have special access to enter certain areas, he said.



Le was to be married Sunday on New York's Long Island to Jonathan Widawsky, a graduate student at Columbia University.



"Annie has been planning this wedding for over a year with John, and she was very excited. She's been doing
Whose remains were found? What was her age? Who says the tragedy is "incomprehensible"? Where do they last seen? When were the remains found? Who are they questioning? What was Le's age? Where they found the remains of the student Annie?
Yale University student Annie Le, 24-year-old Powers entering the building in a Yale medical research building several people in the case, 24-year-old Yale medical research building
question: Whose remains were found?, answer: Yale University student Annie Le, | question: What was her age?, answer: 24-year-old | question: Who says the tragedy is "incomprehensible"?, answer: Powers | question: Where do they last seen?, answer: entering the building | question: When were the remains found?, answer: in a Yale medical research building | question: Who are they questioning?, answer: several people in the case, | question: What was Le's age?, answer: 24-year-old | question: Where they found the remains of the student Annie?, answer: Yale medical research building