Maine gunman Robert Card died 8-12 hours before being found, medical examiner says

LEWISTON, Maine - The gunman who killed 18 people in Lewiston, Maine likely died 8-12 hours before he was located, according to the Maine Chief Medical Examiner. 

Robert Card, 40, was found dead of a gunshot wound to the head and the manner of death has been ruled suicide. 

"The postmortem interval based on rigor mortis and other physical signs indicate Mr. Card was deceased likely 8-12 hours before being located," the Office of the Chief Medical Examiner said in a statement.