The newspaper vendor was shot several times by unidentified attackers in the town of Caicedonia in the western province of Valle del Cauca of Colombia, according to media reports.
Arenas was attacked while he was selling copies of a regional daily , Extra Quindío, which ran a story of complaints by relatives of inmates at the Caicedonia prison who accused guards of mistreating them.
Journalist Andrés Mauricio Osorio said that Arenas, who served as the paper's unofficial stringer because it had no permanent reporter in the town, had approached him with the story, helped find sources and then taken photographs.
After his murder, another vendor quoted in the story received a threatening phone call with a message. “First one down.”
Source: The Guardian