1.2.2 - Removed From Play
Core Rules, p. 8
Sometimes models will be removed from play, most commonly if they are slain (see 9.2), flee (see 6.7) or in a Transport (see 6.1.2). Place models that have been removed from play to one side, so they are no longer on the battlefield. They are no longer part of your army for the purposes of being on the field.