Loni Anderson’s cause of death has been confirmed as a rare and aggressive form of uterine cancer that occurs in just 6 out of 1 million women in the U.S. each year.

Loni Anderson’s cause of death was confirmed as metastatic uterine leiomyosarcoma, a rare and aggressive form of cancer that starts in the uterus and often spreads to the lungs and liver. Anderson is survived by her husband Bob Flick, two children, and several grandchildren, and is remembered for both her television and film work.

The cause of death for actress Loni Anderson has been confirmed less than three weeks after she died at age 79. Anderson died of metastatic uterine leiomyosarcoma, a rare form of cancer, according to a death certificate obtained by TMZ on Friday.