"The capture of Valdez Villarreal is a high-impact blow against organized crime," said Alejandro Poire, a spokesman for Mexico's president on security issues. "This is an important step in the national security strategy."
Valdez was responsible for smuggling about a ton of cocaine a month into the United States, authorities said Tuesday. They also displayed automatic rifles, ammunition and bags believed to contain drugs -- items they said police seized as they arrested him Monday.
Authorities said they're continuing to investigate to try to learn more about Valdez's organization.
Investigators arrested six people along with Valdez -- four men and two women, the state-run Notimex news agency reported. The six provided logistical help to Valdez in Mexico's Federal District, which includes the capital, Mexico City.
Police recovered automatic weapons, nine packets of cocaine and three vehicles in the arrest, Notimex reported.
Authorities identified the six who were arrested with Valdez as Maricela Reyes Lozada, 40; Juan Antonio Lopez Reyes, 26; Maritzel Lopez Reyes, 18; Mauricio Lopez Reyes, 25; Arturo Ivan Arroyo, 26, and Jorge Valentin Landa Coronado, 28, the news agency said.
Viviana Macias, a spokeswoman for the federal attorney general's office, said Valdez' capture came after a shootout.
The arrest, a high-profile win for Mexican authorities, followed intelligence operations in six Mexican states to determine Valdez's whereabouts, Poire said. He was captured in the state of Mexico, which borders Mexico City.
Valdez was allegedly a one-time top lieutenant of Mexico's most wanted man, Joaquin "El Chapo" Guzman.
Valdez later joined the breakaway Beltran Leyva cartel, but the leader of that group, Arturo Beltran Leyva, was killed in a shootout with Mexican officials late last year. Beltran's brother Carlos was arrested, leaving Valdez in a fight to fill a power vacuum in one of Mexico's most powerful drug cartels.