Police and government officials, pictured at a press conference in Mexico City on April 24, announce the arrest of a suspect in the murder of journalist Javier Valdez Cárdenas. (CPJ/Jan-Albert Hootsen)
Police and government officials, pictured at a press conference in Mexico City on April 24, announce the arrest of a suspect in the murder of journalist Javier Valdez Cárdenas. (CPJ/Jan-Albert Hootsen)

Mexico must identify mastermind in murder of Javier Valdez Cárdenas