The shooter did n't leave a note , so investigators are asking family and neighbors about a possible motive , the sheriff said . Police says one off suspect was found dead of lung cancer . In all , 40 of a small town 's 50 residents were found dead or killed overnight . Joseph William Aldridge allegedly killed himself after slaying three people , injuring another in Springfield , Missouri .
Police says one off suspect was found dead of lung cancer . In all , 40 of a small town 's 50 residents were found dead or killed overnight . Joseph William Aldridge allegedly killed himself after slaying three people , injuring another in Springfield , Missouri .