Raymond Clark III (right), a former animal research technician at Yale University, pleaded guilty on Thursday, March 17, 2011, to the murder and sexual assault of Yale graduate student Annie Le (left) in 2009. (AP Photo)

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Raymond Clark III (right), a former animal research technician at Yale University, pleaded guilty on Thursday, March 17, 2011, to the murder and sexual assault of Yale graduate student Annie Le (left) in 2009. (AP Photo)