In February, Immigration and Customs Enforcement agent Jaime Zapata,32,  was killed when he and another agent were ambushed in San Luis Potosi. Monday, Mexican authorities said they had arrested a leader in the Zetas drug cartel connected to the killing.

Jesus Enrique Rejon Aguilar aka “El Mamito” has been arrested in connection to the agent’s death. Rejon is allegedly a member of Los Zetas, one of Mexico’s most powerful and violent drug cartels.