Loni Anderson, twice Emmy-nominated star of WKRP in Cincinnati, died of a rare form of cancer, according to a death certificate obtained by TMZ.

Loni Anderson’s cause of death has been revealed nearly three weeks after the “WKRP in Cincinnati” star’s shocking passing at age 79. Anderson’s death certificate, obtained by TMZ on Friday, disclosed that the beloved actress passed away from an extremely rare and aggressive form of cancer called metastatic uterine leiomyosarcoma.