The garnishee summons and affidavit shall also be served on the defendant to the action, either before or within thirty days after service on a garnishee, unless service of the summons in the action is made without the state or by publication, or by registered mail pursuant to § 21-18-11. If the defendant appears in the action by attorney, service may be made upon the attorney or upon the defendant.
SDCL 21-18-10