Police have linked DNA found on a bloody sock hidden in a ceiling close to where Yale graduate student, Annie Le, was murdered to Raymond Clark, the Associated Press reported.

Le's body was found stuffed behind a wall in the Yale research lab in September. A green pen with Clark's DNA was also found under Le's body.

Clark has been charged with the murder.

Le and Clark had worked together in the lab. When investigators came to inspect the scene there was a box of wipes splattered with blood which Clark tried to hide from the investigator.

Clark aroused investigators suspicions when he suddenly started scrubbing an area on the floor that seemingly appeared clean.