A veteran of the United States Marine Corps became a drug dealer in Mexico. Ángel Domínguez Ramírez Jr., having been Marine, became a capo in Mexico. His criminal empire achieved it through three factors: his military training, bribes to corrupt authorities, and the alliance between rival cartels, Sinaloa, the Jalisco Nueva Generación (CJNG), the Gulf, and the Beltrán Leyva clan.

According to the US government, Domíguez Ramírez has an organization under his command, called 'Zeta 39' (because he was recruited by 'Los Zetas') or 'Follow-up 39' imported large shipments of drugs from countries such as Peru, Venezuela, and Ecuador. They used boats, planes, and trucks that took the cargo from the state of Chiapas to the borders of Texas and California, in the USA. UU Other versions suggest that he is a former operator of the Beltrán Leyva.

In addition to the above, little is known about the former marine. He has dual nationality, Mexican and American, also limps due to an injury he suffered during his military service. A police officer from Mexico City named Ivan Reyes Arzate warned him that a DEA agent had asked for his help in arresting him and even showed him evidence of the investigation being carried out by the Drug Control Administration.

In 2016 he was arrested in Mexico and to this day his extradition to San Diego is pending due to charges of drug trafficking and money laundering. According to the DEA, his cell conspired to import cocaine from Mexico, Costa Rica, Nicaragua, and other countries, to the American Union.

He is linked to Mario Alberto Marrufo Mata, alias 'Alfil'; Jesús Barrera Gómez, nicknamed 'Meridio'; Wong Hung NG, better known as 'Mau'; Gilberto Gerardo 'Lic' Villalobos Zamora; and Carlos Flores Martínez, alias 'Félix'. Prosecutors in charge of his case say his investigation revealed "an unprecedented level of corruption within the Mexican government, local police departments, federal law enforcement agencies, and the Army." Also, his brother Alfred, aka 'El Mochomo', is serving a life sentence in a US prison.