A man who was declared not guilty by reason of insanity will stay in the custody of the Illinois Department of Human Services after his plea for release was rejected by a state appeals panel on Tuesday.Sean Gunderson was remanded to state custody after his 2005 bench trial, where he was charged with attempted murder for slashing the throats of his mother, father and grandmother three years earlier.In 2015, Gunderson requested his release or on-grounds pass privileges. As his request proceeded through trial and appellate …