A fertility clinic should not have used the frozen sperm of a dead man to impregnate his mistress, the Sixth District Court of Appeal ruled Monday.

The ruling marked a victory for Katherine “Kathy” Pesic, whose late husband, Silvaco Group Inc. founder and CEO Ivan Pesic, posthumously fathered twins with another woman through in vitro fertilization. The mother, a Silvaco accountant named Joyce Chin, later filed a creditor’s claim for $9 million in child support with Kathy Pesic.