At least two Connecticut news organizations are reporting police have a suspect in the brutal death of Yale graduate student Annie Le.
The New Haven Independent and the New Haven Register report a Yale lab employee is being looked at by law enforcement.
The technician works in the same Yale building where Le's body was found stuffed in the wall, the Register reported, citing multiple police sources.
He reportedly had scratches on his chest and was being investigated prior to police finding Le's body Sunday, according to the Register.
The unidentified lab tech failed an FBI polygraph exam and during questioning asked for an attorney to be present, the Register reported.
The Independent reported the suspect is not in police custody.
Police, however, have refused to say if they have a suspect in her death.
Le was last seen on surveillance video Tuesday entering the five-story laboratory building in Yale's medical complex, where she worked as a graduate pharmacology student.
She was supposed to have been married Sunday on New York's Long Island.
Police on Monday confirmed the body found Sunday was the 24-year-old.
Police told the Associated Press Monday that the killing of the person whose body was found in the wall was "not a random act" — and said they don't believe that anyone else on the campus is in danger.
Yale President Richard Levin offered support to Le's family and her fiance, Columbia University graduate student Jonathan Widawsky.
"The family and fiance and friends now must suffer the additional ordeal of waiting for the body to be positively identified," Levin said.
The university has also planned an evening prayer vigil for Le Monday on Yale's main campus. An e-mail sent to the Yale community invites participants to "bring a candle and join us in solidarity," the Yale Daily News reported.
In an e-mail statement sent to FOXNews.com, Yale's vice president Linda Lorimar said the university was taking extra security precautions — including added security personnel and a new bicycle patrol — to ensure students' safety.
They previously have said Widawsky is not a suspect and is assisting with the investigation. New Haven Assistant Police Chief Peter Reichard said police recovered "a large amount" of physical evidence, but he would not discuss what that included.
Le was reported missing last Tuesday. Surveillance video shows her arriving at around 10 a.m., but police could find no video of Le leaving, despite some 75 surveillance cameras operating around the complex. Her ID, money, credit cards and purse were found in her third-floor office.
More than 100 local, state and federal police had been searching the building for days, using blueprints to uncover any place where evidence or Le's body could be hidden.
On Sunday morning, a state police van drove down a ramp into the building's basement area. Authorities also sifted through garbage at a Hartford incinerator Sunday, looking through trash that was taken from the building in the days since Le went missing.
Le's disappearance weighed heavily on Yale students, who prayed for her safe return Sunday at The University Church on Yale's campus.
"It has brought up a lot of fears for people," the Rev. Ian Buckner Oliver said just before he gave the Sunday morning sermon. "It has brought up a lot of worry and concern for her and for all our safety."
FOX News' Rick Leventhal and the Associated Press contributed to this report.