The guilty verdict against the kingpin, whose real name is Joaquín Guzmán Loera, ended the career of a legendary outlaw who also served as a dark folk hero in Mexico, notorious for his innovative smuggling tactics, his violence against competitors, his storied prison breaks and his nearly unstoppable ability to evade the Mexican authorities.

The jury’s decision came more than a week after the panel started deliberations at the trial in Federal District Court in Brooklyn where prosecutors presented a mountain of evidence against the cartel leader, including testimony from 56 witnesses, 14 of whom once worked with Mr. Guzmán. He faces life in prison at his sentencing.