The family of a man who died five days after being found barely alive on the floor of his office at the University of Southern Maine says he lay there for days over a holiday weekend before he was discovered. David Norton, a senior communications specialist for the University of Maine System, died at a hospital Oct. 15, five days after he was found by campus police in his Portland office. Police and his family think Norton lay stricken by a stroke in his office from the Friday before Columbus Day weekend until the following Wednesday. Police found the 45-year-old Norton after a co-worker reported he had missed a meeting and couldn’t be contacted. Norton’s mother, Linda Norton, tells The Portland Press Herald police should check offices more often.