Euphemia Mondich (1884 – August 20, 1961), known as Lady Bluebeard, was a Polish–American bigamist, murderer and suspected serial killer who killed at least one husband and a lover in Detroit, Michigan, on two separate occasions in 1921.

The couple lived together with seemingly no issues for around three years, until Euphemia suddenly deserted him in September 1924, taking $5,700 with her for a supposed move back to her native Poland.

Four days later, they received an anonymous tip that Mondich was attempting to sell her property at the County Building, where she was arrested and jailed on a murder charge.

After excavating the house and uncovering a complete human skeleton, initially believed to be Sokolsky, the investigators were shocked to learn that this was her lover, John Udurovich.

[4] Mondich was then brought back to the police station for further questioning, where they learned that she had been in a total of nine relationships across Poland, Canada and the United States, but authorities were unable to locate all of her husbands and suitors.

[7] Mondich was then transferred to the Detroit House of Correction in Plymouth Charter Township, where she remained until her death of a heart attack on August 20, 1961, aged 77.

[8] According to Superintendent Jonathan Goldsmith, Mondich had no visitors during the last ten years of her life and spent most of her time tending to the prison flower garden and feeding stray animals.