NEW : Attorneys say they might enter plea of not guilty by reason of insanity . T.J. Lane , 17 , is accused of fatally shooting two high school classmates in Florida . He was indicted on charges of attempted murder , felonious assault . A judge ruled in May that he can be tried as an adult .
NEW : Attorneys say they might enter plea of not guilty by reason of insanity . T.J. Lane , 17 , is accused of fatally shooting three high school classmates in February . He was indicted on charges of aggravated murder , felonious assault . A judge ruled in May that he can be tried as an adult .