In August 1901, he hired Marsh as a barmaid for the Monument Tavern. He again entered into a false marriage with her, and was physically abusive to her. She was also eventually poisoned to death.
But after only a year, Chapman grew tired of Maud and turned his attention to a Florence Rayner, who refused his requests to leave for America with him. When Rayner insisted, "No, you have your wife downstairs," Chapman snapped his fingers and said "Oh, I'd give her that, and she would be no more Mrs. Chapman."
And like his other two victims, Chapman beat Maud without abandon. Maud confided in her sister on a tramride down Streatham Hill one day, warning her: "You don't know what he is."
And so she began suffering strange symptoms similar to those of her predecessors. Mrs. Marsh noticed how eagerly her daughter's lover insisted on preparing her medicine and called in an independent doctor to examine her. This frightened Chapman into giving her a tremendous dose of the poison, and Maud was to succumb to it the next day, October 22, 1902. The doctor refused to issue a death certificate, and when traces of arsenic and 7.24 grains antimony were found in Maud's stomach, bowels, liver, kidneys, and brain in the post mortem, Chapman's days of wife-poisoning were ended for good. (It turns out that it was the antimony which killed her -- the arsenic was only there as an impurity in the antimony). He was arrested by Inspector Godley on October 25th, upon which it was discovered that Severin Klosowski and George Chapman were one in the same.
The bodies of his two previous "wives" were exhumed in November and December of 1902. Bessie's corpse had a mouldy growth upon it but was otherwise fresh, while Mary (having been buried five years) was remarkably well preserved. As Elizabeth Waymark said, "She looked as if she had only been buried about nine months.. The face was perfect." Large amounts of metallic antimony were found in the bodies of both women.
Chapman was charged with the murders of Maud Marsh, Mary Spink, and Bessie Taylor, but although evidence was submitted on all three, he was convicted only of Maud's death on March 20, 1903. The jury took only eleven minutes to come to a decision of guilty.
Chapman said nothing after his incarceration in way of a confession; in fact, he continued to protest his innocence for the rest of his life. He was restless and irritable, but above all he was quiet. After his appeal was disregarded by the Home Secretary he was put on suicide watch.
Chapman was hanged at Wandsworth prison on April 7th, 1903.