1980: Elizebeth Friedman Died.
Elizebeth Friedman was inducted into the NSA Cryptologic Hall of Honor in 1999. Read about her life and accomplishments via the link at the end of the page to her NSA Hall of Honor page.
From the Hall of Honor: "Although she is often referred to as the wife of William Friedman, she enjoyed many successes in cryptology in her own right and has been dubbed "America's first female cryptanalyst." In fact, although her husband is credited with numerous contributions to cryptology, it was Mrs. Friedman who introduced him to the field......."
You can also read more about Elizebeth Friedman in "Cracking the Code" by The Hillsdale Collegian on vmcooney.com (link below).