From the November 9, 1904 New York Times:

“EVANSTON, Wyo.–Mrs. Leon Demars, shot in a duel with her neighbor, Mrs. Nancy Richards, is dead. Several times the women had come to blows, and each had warned the other that the next time would be with guns.

Mrs. Demars went to Mrs. Richards’s ranch, near Fort Bridger, and upon being ordered away, displayed a big revolver.

Mrs. Richards drew a pistol, and at the second shot Mrs. Demars fell with a bullet in her breast, but kept on firing, emptying the revolver. Mrs. Richards also fired six shots.

Both are wives of ranchers. They are thirty years old.”