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Antonio de la Cruz, a journalist for local newspaper Expreso, was shot and killed in his home in the Tamaulipas state capital Ciudad Victoria, the paper he worked for said.
Tamaulipas is a Gulf coast state, just south of Texas, where violent drug cartels fight over lucrative smuggling routes. Local journalists who focus on crime and corruption are especially vulnerable.
De la Cruz's death follows at least eight other media workers who have been murdered in Mexico this year as a result of their journalism, according to human rights organization Article 19.
Early clues "suggest that his murder may be linked to his political criticism" as a journalist, Leopoldo Maldonado, regional director of Article 19 in Mexico and Central America, told Reuters.