Madeleine Duncan Brown (July 5, 1925 – June 22, 2002) was an American woman who claimed to be a longtime mistress of United States President Lyndon B.

[5] According to Brown, she was raised in a middle-class Catholic household in Dallas, Texas, where her father was a utility company supervisor and her mother was a housewife.

[2][5][6][7] She described her husband as a veteran of the United States Marine Corps whose "war experiences had shattered his nerves, and turned him into a hopeless, physically abusive drunkard".

[2][5] On November 5, 1982, Brown spoke at a news conference held at the Dallas Press Club, alleging that she had an extramarital relationship with Johnson for almost twenty years.

"[6][7] The suit included an affidavit from Madeleine Brown, alleging that she met President Johnson in 1948 at a social function within a Dallas hotel, then had an affair with him that lasted from 1948 until 1969.

[6][7] According to her affidavit, Ragsdale, a deceased Dallas attorney, was assigned to assist with legal issues regarding her pregnancy and later claimed to be the child's father in order to shield Johnson from negative publicity.

[6][7] Betty Tilson, the press secretary for Lady Bird Johnson, was quoted as stating: "We're convinced the whole thing is made-up, frankly.

[2] Brown alleged that after the birth of Steven in 1950, Ragsdale provided her with "a six-room house for $15,000, complete with a live-in maid", and paid the various charge cards he supplied to her.

[2] Brown told People that her sexual relationship with Johnson abruptly ended in 1967 after she was badly injured in a car accident in which her son, Steven, was at the wheel.

[2] Brown stated that she was hospitalized after suffering a heart attack in February 1987 and, expecting to die, called Steven to her bedside in order to confess hiding the true identity of his father from him.

[2] After the paternity claims, Brown made other allegations suggesting that there was a conspiracy to assassinate Kennedy, including the charge that Johnson had foreknowledge of a plot.

[4] In November 2012, The Dallas Morning News published an article by Hugh Aynesworth describing David Perry's efforts to disprove Brown's allegations.

[4][19] According to Perry, he and his wife met Brown at a social function a few years after she made her original allegations as to the JFK assassination but did not find her story to be believable.

[4] He said he initially decided to investigate Brown's conspiracy claim of Johnson and other notable individuals attending a party at Murchison's house.

[4] Perry pointed to evidence placing key figures outside of Dallas on the evening of November 21, 1963, including Johnson (with Kennedy in Houston and in Fort Worth), Murchison (in East Texas), and Hoover (in Washington, D.C.).