Friday marked the third anniversary of the murder of Mexican journalist Javier Valdez, who had freelanced for AFP for a decade and was a correspondent for the national daily La Jornada and co-founder of the weekly Riodoce
In 2019, 10 journalists were killed in Mexico, according to an RSF count.
He was confirmed as the second journalist to be murdered in Mexico this year following Maria Elena Ferral, who was shot dead by two assailants on motorbikes when getting into her car in the eastern state of Veracruz in March.
RSF, which said Armenta was the third journalist killed this year, is investigating the type of protection he had.
MEXICO: Mexican journalist Jorge Armenta was killed Saturday in Ciudad Obregon in the country's north, making him the third journalist slain in Mexico so far this year, authorities said.