The gunman who killed 23 people in a racist attack at a Walmart in El Paso — one of the deadliest mass shootings in US history — pleaded guilty Monday to capital murder in a state district court.

A 42-year-old El Paso man at the center of a human smuggling and money laundering operation has pleaded guilty to federal charges, officials announced this week. Jose Luis Avalos, identified by prosecutors as the ringleader of the smuggling scheme,

Nearly six years after a man fatally shot 23 people in a racist attack targeting Hispanic shoppers at a Walmart in Texas near the U.S.-Mexico border, the gunman's criminal case is set to come to a close.