The chief state's medical examiner's office released the autopsy results Wednesday of the 24-year-old Yale graduate student whose body was found inside a basement wall on Sunday.
A medical examiner spokeswoman said Annie Le died by traumatic asphyxia due to neck compression.
Police arrested a Yale University lab technician on Thursday and charged him with the murder of Annie Le.
Raymond Clark, also 24, was taken into custody Tuesday night at his apartment in Middletown, Conn., and was released into the custody of his attorney early Wednesday after collecting DNA samples and questioning him in Le's death, New Haven police said.
Bloody clothes were said to be found stuffed in a ceiling panel in the Yale lab basement that cannot be attributed to Annie Le, and Raymond Clark's DNA is likely being compared to that evidence at this time.
Clark was grilled on Wednesday by police. New Haven Police Chief James Lewis told a news conference there were no other suspects.
This is not about urban crime, university crime or domestic crime but an issue of workplace violence, which is becoming a growing concern around the country, Lewis said.
Marks on Le's body indicated she was strangled or asphyxiated using some kind of weapon.
Clark had worked at the Yale campus for several years and was in the same building where Le carried out her research.
He is being held on a $3 million bond and is due back in court in early October.
Yale University President Richard Levin said Clark had been barred from the campus and his Yale ID card disenabled.