619.8  Necessity to plead.
  No mitigating circumstances shall be proved unless pleaded, except such as are shown by or grow out of the testimony introduced by the adverse party.
[R60, §2929; C73, §2682; C97, §3593; C24, 27, 31, 35, 39, §11173; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §619.8]