Authorities investigating the murder of Yale graduate student Annie Le have focused their efforts on a suspect who failed a lie detector test, sources told ABC News.
Investigators zeroed in on a suspect as the medical examiner positively identified the body found stuffed in a wall in a Yale University lab as the missing grad student. The medical examiner's office listed the cause of death as homicide, but withheld the exact manner in which Le died.
The body was discovered Sunday, the same day that Le was supposed to get married.
The suspect who police are looking at has what appear to be defensive wounds, a key piece of circumstantial evidence. In addition, the suspect, who authorities believe knew Le, failed a lie detector test, sources told ABC News. Sources also told ABC News that bloody clothing removed from the lab contained evidence that links the killer to the crime.
Investigators have been looking at everyone from Yale maintenance people to people who worked in the lab and fellow students.
"We're not believing it's a random act," Officer Joe Avery, a police spokesman, told The Associated Press. He would not provide further details but said no one else is in danger.
A body believed to be Le's was found Sunday evening, stuffed into a wall in the basement of the Amistad Street laboratory where she was last seen Tuesday morning.
Though police have seemingly narrowed in on a suspect, the mood around Yale is still one of sadness and uncertainity. The last on-campus murder was the 1998 stabbing death of 21-year-old Suzanne Jovin. There has been no arrest in her death.
Reached in Germany, Thomas Jovin told ABCNews.com that he did not wish to comment on Le's murder or his daughter's.
New Haven Police Officer Joe Avery told ABCNews.com today that authorities didn't start focusing on the lab until a few days after Le was reported missing. Police were initially unsure, he said, if she had voluntarily disappeared in advance of her wedding, scheduled for Sunday, or if she had been a crime victim.
Once video surviellance cameras revealed Le coming into the building on Tuesday, but not leaving. Search efforts focused on the building. Her body was eventually found, he said, by members of the Connecticut State Police Major Crimes Unit.
Vanessa Flores, Le's former roommate, said she heard the news on the Internet about her friend's body likely being found.
"I had a very tough time just reading the headline," she told "Good Morning America" today. "It was very difficult."
Le, 24, disappeared Tuesday. She had been seen entering the Amistad Street lab around 10 a.m., but none of the cameras caught her leaving. The body was found shortly after 5 p.m. Sunday, shoved into a space in the wall meant to conceal pipes and wiring.
"We did locate the remains of a human. ... We are assuming that it is her at this time," New Haven Assistant Police Chief Peter Reichard told reporters in a brief news conference Sunday.
Flores said she doesn't know why anyone would want to kill her friend, who earlier this year had written a piece for the University Magazine questioning the safety of the New Haven campus.