In November 1958, Frank Duncan’s pregnant wife, Olga Kupczyk, disappeared without a trace from their Santa Barbara home after enduring months of abusive treatment from her mother-in-law. A short time later, Frank’s marriage was inexplicably annulled after his mother, posing as Olga, showed up at the local courthouse with a man she’d hired to pose as her son, Frank.
One month later, in mid-December, investigators in the small coastal town of Carpinteria, California, were directed to the location of Olga’s body in a shallow grave, after one of her killers confessed to kidnapping and murdering her the previous month. The arrest of Augustine Baldonado and his accomplice, Luis Moya, solved the mystery of what happened to Olga, but when it came to the motive for the murder, the truth was more shocking than anyone had expected.
References
Associated Press. 1959. "Mrs. Duncan shouts 'liar' at friend in court." Modesto Bee, March 1: 2.
Blake, Gene. 1958. "Body of missing bride unearthed." Los Angeles Times, December 22: 1.
—. 1959. "Find Mrs. Duncan guilty of murder." Los Angeles Times, March 17: 1.
—. 1959. "Mrs. Duncan held sane, faces death." Los Angeles Times, March 25: 1.
—. 1959. "Mrs. Duncan tried to hire her to kill, carhop says." Los Angeles Times, February 25: 2.
—. 1959. "Mrs. Duncan's son weeps when death story is told." Los Angeles Times, February 27: 2.
Hertel, Howard, and Paul Weeks. 1962. "Mrs. Duncan dies with 2 conspirators." Los Angeles Times, August 9: 1.
Holt, Bob. 1959. "Frank Duncan in court outburst as D.A. Gustafson questions mother." Ventura County Star, March 5: 1.
—. 1959. "Jury out 4 hours, 51 min. debating fateful verdict in murder-for-hire case." Ventura County Star, March 17: 1.
—. 1959. "Mrs. Duncan testifies in own defense; admits 'plot' to break up marriage." Ventura County Star, March 4: 1.
Larkin, Deborah Holt. 2022. A Lovely Girl: The Tragedy of Olga Duncan and the Trial of One of California's Most Notorious Killers. New York, NY: Simon and Schuster.
Los Angeles Times. 1958. "Body of missing wife pointed out." Los Angeles Times, December 22: 1.
Martinez, Arlene. 2013. "Love, scandal and murder: Ventura County case drew national attention." Ventura County Star, June 30: 2013.
Renner, Joan. 2013. "Mother-in-law knows murdwer: The tragic death of Olga Kupczyk." Los Angeles Magazine, June 17.
The People of California v. Elizabeth Ann Duncan. 1960. 6490 (California Appeals Court, March 11).
Ventura County Star. 1958. "Grand jury set for murder case." Ventura County Star, December 23: 1.
Welsh, Nick. 2022. Elizabeth Duncan: The Last Woman Executed in California. October 13. Accessed November 11, 2025. https://www.independent.com/2022/10/12/elizabeth-duncan-last-woman-executed-california-history/.
Williams, Brad. 1958. "Mother-in-law in jail on charge of fake annulment." Los Angeles Times, December 16: 1.
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