Jesús Antonio Gamboa Urías, a Mexican journalist who edited the online news site Nueva Prensa, was found dead a week after being abducted.
His body, riddled with gunshots, was found in a village near the city of Los Mochis, in the north-western state of Sinaloa, which is one of Mexico's most violent regions.
The International Press Institute (IPI) has called for a full investigation into his death.
"This case represents yet another blow to press freedom in Mexico, a country that has been ravaged by violence and impunity for several years now," said Vanessa Garnica, IPI's press freedom adviser for Latin America and the Caribbean.
According to the freedom of expression organisation, Article 19, Mexican journalists have been the victim of at least 222 incidents of aggression so far this year.
And Gamboa Urías, 39, is the fifth journalist to be killed in Sinaloa since 2004. The state is home to the powerful drug cartel of the same name.
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