So far this year five journalists have been murdered in Mexico, one of the world's most risky countries for media workers.
Valdez was shot and killed today near the offices of Ríodoce, the local weekly he founded in 2003 in Culiacán, the capital of Sinaloa state, according to reports. The official was not authorized to discuss the matter publicly and spoke on condition of anonymity.
This year's killings "are apparently unconnected occurrences but they are happening in a pre-electoral context and in an environment of tension in which there are groups that may want to create fear", said Jose Reveles, a journalist and writer specializing in drug trafficking.
MEXICO CITY (AP) Javier Valdez was driving in broad daylight down a street he must have known well, just a block from his office, when he became the latest victim of a wave of journalist killings that has hit Mexico. "He never talked about it so as not to drag people into it", Rafael Valdez told the AFP news agency. So I asked him why he risked his life and he replied: 'It is something I like doing, and someone has to do it.
"Being a journalist in Mexico seems more like a death sentence than a profession". The Mexican authorities are expected to effectively protect journalists, to allow them to work without fear of reprisals and to end impunity in the cases of crimes against journalists and activists.
Tania Reneaum, director of Amnesty International Mexico, urged independent investigations into the murders of Valdez and other journalists. Experts say Guzman's arrest previous year and extradition in January have led to upheaval in the area as rival factions war for control of the gang.
He had written about the Sinaloa drug cartel and its now-detained founder Joaquin "El Chapo" Guzman.
"Every time we think things are really going to change, there is another murder".
Valdez was one of Mexico's most well-known, and loved, chroniclers of the drug war, winning the International Press Freedom Award from watchdog group the Committee to Protect Journalists (CPJ) in 2011 for his prolific coverage of trafficking and organized crime.
According to UNESCO, Bokova has denounced the killings of three other Mexican journalists so far this year.
Reporters Without Borders (RSF) ranks Mexico as the third most deadly country for journalists in the world - after Syria and Afghanistan. Ricardo Sanchez Perez del Pozo, a lawyer with a background in worldwide law and human rights, took over the post.