An aide to Chapo Guzman, Mario Nunez Meza, arrested a decade ago, was quietly extradited to El Paso in late December and will appear in court this Monday for a bail hearing. Nunez Meza, aka M10, was one of Guzman's chief men on the ground in Juarez during the bloody war there. 
The El Paso case has focused on Sinaloa defendants & their involvement in the brutal war in Juarez. Another Guzman aide, Noel Salgueiro Nevarez, was also recently extradited to face charges in El Paso. The assassin, Antonio Marrufo, aka, El Jaguar, is also being prosecuted there.
The El Paso case, which names Guzman as a defendant, is one of the US govt's most secretive cartel cases. In the past year, 139 documents have been placed on the docket. 68 of them are sealed.
M-10 was among other things deeply involved in the cartel's efforts to corrupt govt/law enforcement officials. Here's a transcript of him talking to Guzman about a recalcitrant policeman in Durango & how he was in touch on "a daily basis" w/the governor to keep the cop in line.
UPDATE to El Paso case: According to documents filed Friday, Antonio Marrufo, aka the Jaguar, has reached a plea agreement w/prosecutors in Texas. Given the rampant sealing in this case, we don't know when it was reached or what it entails but there appears to be a deal in place.
