15-6-9(h). Unknown party--How designated in pleadings and process. When a party is ignorant of the name of an opposing party and so alleges in his pleading, the opposing party may be designated by any name, and when his true name is discovered the process and all pleadings and proceedings in the action shall be amended by substituting the true name.
Source: SDC 1939 & Supp 1960, § 33.0401; SD RCP, Rule 9 (h), as adopted by Sup. Ct. Order March 29, 1966, effective July 1, 1966.