Federal authorities arrested a suspect in the Valdez case in April, a rare step in a country where most homicides, including those of journalists, go unpunished. Still, press freedom groups such as the Committee to Protect Journalists have pushed investigators to do more, saying the suspect who was arrested was probably a low-level assassin and not the mastermind of the attack..

http://www.latimes.com/world/la-fg-mexico-journalist-killed-20180515-story.html