Yale lab tech Raymond Clark III was arrested Thursday morning in connection with the murder of grad student Annie Le. He has been charged for her death, with bond set at $3 million. Records of their ID cards show that he was the last person to see Le alive, law enforcement sources tell the Hartford Courant, and the New Haven Register reports he has been linked to the crime through DNA. According to the swipe cards, Clark entered a room where Le was—and then she never used her card again. The records also show that Clark moved around the building in uncharacteristic ways, including the spot where Le’s body—she died of suffocation—was found. Clark, 24, had been named a “person of interest” in Le’s murder.