A cartel lieutenant who spent more than a decade hiding out in Mexico to dodge a federal drug indictment was sentenced Wednesday to 18 years and 10 months in prison for running weapons, cash and cocaine through an Atlanta-based trafficking network. Roberto Lopez, 46, known by the street aliases “Shrek” and “NWA,” had been the primary lieutenant for a distribution ring operated by cartel bosses Edgar Valdez-Villarreal and Carlos Montemayor before he fled prosecution and vanished across the border.
According to FOX 5 Atlanta, Lopez managed major cocaine distribution networks for the Sinaloa and Beltran-Leyva cartels, and the network he served shipped up to 300 kilograms of cocaine weekly into Atlanta, Memphis and other cities. Federal prosecutors say Lopez was originally based in Laredo, Texas, before fleeing to Mexico, and he personally converted semi-automatic rifles into fully automatic machine guns and manufactured silencers for cartel enforcers, according to the Department of Justice. Federal law enforcement had also intercepted Lopez on wiretaps arranging payments for truck drivers and stash house operators, per the station's report.
A Weapons Pipeline Running South
The operation didn't just push drugs north — it pushed guns south. The station's report indicates the operation smuggled over 1,000 rifles and up to 200 converted machine guns into Mexico, along with silencers, body armor and night vision gear. That domestic gun conversion work directly armed cartel enforcers in Mexico, the Justice Department noted in announcing Lopez's case.
The financial side of the operation ran on the same scale. The network smuggled millions of dollars in drug money back across the border, with the trafficking operation managed by Valdez-Villarreal and Montemayor moving bulk cash shipments, according to the Department of Justice. During one six-month window, the ring distributed 1,500 kilograms of cocaine in Atlanta alone, per FOX 5 Atlanta's reporting.
From Mexico City Arrest to Guilty Plea
Federal indictments first disrupted the cartel network in December 2009, but Lopez fled to Mexico to avoid prosecution rather than face the charges alongside his co-defendants. He remained a fugitive for roughly 15 years until Mexican authorities captured him in Mexico City in June 2024. He was expelled to the United States in August 2025.
Hoodline previously reported on his initial court appearance, when Lopez pleaded not guilty at a September 2025 arraignment before U.S. Magistrate Judge Linda T. Walker, who ordered him detained without bond. That detention held until Lopez pleaded guilty on May 19, 2026, to conspiracy to possess with intent to distribute cocaine and conspiracy to commit money laundering. The drug conspiracy charge carried a possible maximum term of life in prison, while the money laundering conspiracy carried a maximum term of 20 years.
Kingpins Sentenced Years Earlier
Lopez's sentence closes out the executive tier of a network whose leaders were already serving lengthy terms. Edgar Valdez-Villarreal, known as “La Barbie,” was sentenced to 49 years and one month in prison in 2018 at Atlanta federal court and ordered to serve 10 years of supervised release afterward. Valdez-Villarreal grew up in Laredo, Texas, and played linebacker at Laredo United High School, according to The Guardian.
At that June 2018 sentencing, Valdez-Villarreal was ordered to forfeit $192 million in drug proceeds tied to an estimated 12,000 kilograms of cocaine smuggled into the United States, the Atlanta Journal-Constitution reported. Montemayor, described as a U.S.-based businessman, was sentenced to 34 years and three months in prison in 2019 and ordered to serve 10 years of supervised release. The Department of Justice has noted that Montemayor used his established trucking infrastructure and driver networks to move multi-hundred-kilogram cocaine shipments across the border.
Co-Defendants Fell One by One
The 2009 indictment eventually swept up numerous other members of the ring.
Atlanta was one of the cities served by the network described above.
Sentence Marks Latest Task Force Win
Lopez will serve five years of supervised release once his prison term ends, and officials have not publicly disclosed exactly where he will serve his sentence. Court records also do not list specific details regarding asset forfeitures tied directly to his final sentence, unlike the forfeiture order imposed on Valdez-Villarreal years earlier.
U.S. Attorney Theodore S. Hertzberg and Michael J. Connolly, acting special agent in charge of the DEA's Atlanta Field Division, provided information about the investigation and sentencing in official statements, FOX 5 Atlanta reported. The outlet noted that Lopez's sentence marked the latest prosecution tied to a multi-agency Homeland Security task force initiative.
