New Haven, Connecticut (CNN) -- A Yale University lab technician pleaded guilty Thursday to murder and attempted sexual assault in the killing of graduate student Annie Le in 2009. Raymond Clark III will be sentenced to 44 years in prison as part of the plea agreement. In court Thursday, prosecutors described injuries to the victim and evidence of attempted sexual assault. Le, 24, was strangled to death. She had a broken jaw and collarbone, the prosecution said. Clark's DNA was "all over" the crime scene, including in her underwear, the state charged. Le's body was discovered inside a wall of a Yale lab building four days later after an extensive search by the FBI and  police.
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NEW: Raymond Clark III accepts that his semen and DNA were found at the crime scene
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He admits murder and attempted sexual assault under a plea agreement
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Yale graduate student Annie Le's body was found inside a wall at a Yale lab building
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Le was set to be married the day her body was found
"My family and I send deepest sympathy to the Le family," said @placeholder's father, also called Raymond.
@placeholder was not a Yale student but had worked as a lab technician at the university since 2004, after graduating from high school.