Answer by taking a quote from the following article:

Madalyn Murray O'Hair (nee Mays; April 13, 1919 - September 29, 1995), was an American activist, founder of American Atheists, and the organization's president from 1963 to 1986. She created the first issues of American Atheist Magazine. O'Hair is best known for the Murray v. Curlett lawsuit, which led to a landmark Supreme Court ruling ending official Bible-reading in American public schools in 1963. That case came just one year after the Supreme Court prohibited officially sponsored prayer in schools in Engel v. Vitale.

Madalyn Mays was born in the Beechview neighborhood of Pittsburgh, Pennsylvania, on April 13, 1919, the daughter of Lena Christina (nee Scholle) and John Irwin Mays. She had an older brother, John Irwin Jr. (known as "Irv"). The siblings had Irish ancestry on their father's side and German ancestry on their mother's side. At the age of four, Madalyn was baptized into her father's Presbyterian church; her mother was an Evangelical Lutheran. In 1936, she graduated from Rossford High School in Rossford, Ohio.  In 1941, she married John Henry Roths. They separated when they both enlisted for World War II service, he in the United States Marine Corps, she in the Women's Army Corps. In April 1945, while posted to a cryptography position in Italy, she began a relationship with an officer, William J. Murray, Jr., a married Roman Catholic who refused to divorce his wife. Mays divorced Roths, adopted the name Madalyn Murray, and gave birth to a boy, William J. Murray III (nicknamed "Bill").  In 1949, Murray completed a bachelor's degree from Ashland University. On November 16, 1954, she gave birth to her second son, Jon Garth Murray, fathered by her boyfriend Michael Fiorillo. It was rumored that she sought to defect to the Soviet Union at their embassy in Paris, but that the Soviets denied her entry. Murray and her sons returned to the Loch Raven neighborhood of northern Baltimore, Maryland in 1960 to live with her mother and brother.  Murray left Maryland in 1963 and fled to Honolulu, Hawaii, , after allegedly assaulting five Baltimore City Police Department officers who tried to retrieve a runaway girl, Bill's girlfriend Susan (who would later be granddaughter Robin's mother). In 1965, she married U.S. Marine and government informant Richard O'Hair. Although they were separated later, she remained married to him until his death in 1978.

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gave birth to a boy, William J. Murray III (nicknamed "Bill").