S.D. Codified Laws § 22-16-30
Excusable homicide--Lawful acts
Homicide is excusable if committed by accident and misfortune in doing any lawful act, with usual and ordinary caution.
Source: SDC 1939, § 13.2002 (1); SL 1976, ch 158, § 16-5 ; SL 2005, ch 120, § 161.