A release by the injured person of one joint tort - feasor does not relieve him from liability to make contribution to another joint tort - feasor unless the release is given before the right of the other tort - feasor to secure a money judgment for contribution has accrued, and provides for a reduction, to the extent of the pro rata share of the released tort - feasor, of the injured person's damages recoverable against all the other tort - feasors. Source: SL 1945, ch 167 , § 5; SDC Supp 1960, § 33.04A06.