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4 of 8: FILE - In this undated file image provided by Mexico's Attorney General's Office is seen drug trafficker Arturo Beltran Leyva, alias "El Jefe de los Jefes," or "The Boss of Bosses" in an unknown location. Beltran was killed in a shootout with sailors on Dec. 16, 2009, according to the Mexican navy. Experts say the killings and arrests of top cartel capos, like Beltran, have left lesser spawn to run the drug, kidnapping and extortion businesses; that has fueled a cruder approach and a psychopathic, mass-dismemberment style of killing, and is reflected in the new nicknames criminals are using to identify themselves. (AP Photo/Mexico Attorney General's Office, File) (AP Photo/ Anonymous)

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