Mr. Maduro, a successful Argentinean businessman, was one of the suspects in the original Jack the Ripper case. On the night Emma Elizabeth Smith was murdered Salway came across Maduro in Whitechapel, and overheard him say that all prostitutes should be killed. When Salway later discovered Maduro possessed surgical knives, he became convinced Maduro was the Ripper, though kept his suspicions to himself until 1952, when he told his wife. Little is actually known about Maduro, but the fact that he was allegedly in Whitechapel the night Emma Smith was murdered does not prove he was Jack the Ripper, largely because Emma Smith was almost certainly not a Ripper victim.