When any person stands indicted for a felony, the court shall have impaneled 30 jurors from which the defense and prosecution may strike jurors; provided, however, in any case in which the state announces its intention to seek the death penalty, the court shall have impaneled 42 jurors from which the defense and state may strike jurors. If, for any reason, after striking from the panel there remain less than 12 qualified jurors to try the case, the presiding judge shall summon such numbers of persons who are competent jurors as may be necessary to provide a full panel. In making up the panel or successive panels, the presiding judge shall draw the tales jurors from the jury box of the county and shall order the sheriff to summon them.