One of the suspects charged in a fatal Marinette drowning case has entered a plea of not guilty by reason of mental disease or defect, according to court records.Tylor Birch, 22, appeared in court Tuesday for a status conference, where the plea was formally entered.Court records show a status conference was scheduled for Oct. 9 as the state seeks examinations.Birch is one of two defendants charged in connection with the death of 13-year-old Jako…