S.D. Codified Laws § 25-4-4 : — DOMESTIC RELATIONSDIVORCE AND SEPARATE MAINTENANCE —4-4 - Extreme cruelty defined TEXT PDF Extreme cruelty is the infliction of grievous bodily injury or grievous mental suffering upon the other, by one party to the marriage. SDCL 25-4-4 SDC 1939, § 14.0708.