Police are trying to figure out what killed a University of Maine student over the weekend.Dylan Lyford was found dead in his apartment Sunday morning in Old Town. The chemical engineering student is originally from Milo. Police responded to a call on stillwater avenue just after 10:30 A.M.When they arrived they found the 19-year-old student unresponsive. He was taken to to Eastern Maine Medical Center in Bangor where he was pronounced dead. The university has had support staff and counselors on hand to help students cope with the tragedy.Old Town police are not releasing details about the circumstances surrounding the death.