Yale University graduate student Annie Le, whose body was found in the basement wall of an off-campus medical research building, was strangled, a spokesman for the Connecticut medical examiner’s office said Wednesday.

The cause of death was “traumatic asphyxia due to neck compression,” the spokesman said. The office would not release the spokesman’s name.

Le, 24, a pharmacology student, was last seen alive September 8, the day she appeared in a surveillance video entering a four-story lab at 10 Amistad St., about 10 blocks from the main campus.

Her body was found Sunday, on what was to have been her wedding day.