Section 803 - Same; service or publication of summonsA. When the name and address of the legal successor is known, and he is a resident of the state, he shall be summoned to appear and substitute himself for the deceased party within thirty days of the date the summons is served on him.B. When the name and address of the legal successor is known, but he is a nonresident or absentee, he shall be summoned to appear and substitute himself for the deceased party within sixty days of the receipt of the summons through registered or certified mail.C. If the name or address of the legal successor is unknown, the summons shall be by two publications not less than fifteen days apart in a newspaper published in the parish where the action is pending and in the parish of the domicile of the deceased party, which shall summon him to appear and substitute himself for the deceased party within sixty days of the first publication. The summons shall be addressed to the legal successor by name, if the latter is known; and otherwise shall be addressed to "The legal successor of ____________, deceased".