Seven years ago, US special agent Ray Donovan began an in-depth study of the Joaquin "El Chapo" Guzman saga -- and it quickly became an obsession.
Now, the tall, 48-year-old New Yorker displays behind glass in his office the beige T-shirt that prisoner 3912 -- Guzman, the former head of the Sinaloa cartel -- wore when he was extradited from
Mexico to the
United States on January 19, 2017.
It took a massive team and years of work that saw Donovan manage to identify Guzman's suppliers and partners, along with hitmen, lawyers and lovers -- intel that led to captures in 2014 and 2016.