Listeners heard the gunshot that killed Atilano Roman Tirado, who had a weekly radio program as well as leading a group of farm families displaced by a dam.
"On air you could hear when the shot is fired, and then one of the co-workers is heard saying, 'Oh no, he killed him, he killed him,'" station director Sergio Ontiveros said yesterday.
The Fiesta Mexicana station in the Pacific coast city of Mazatlan was off air for about a half hour, and was operated remotely over the weekend before resuming normal operations on Monday morning.
Roman Tirado was a leader of about 800 families demanding compensation for being displaced by the Picachos dam.
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In past years, the movement had staged blockades and protest marches, which had resulted in some arrests. Ontiveros said Roman Tirado focused on the land dispute and other news in his program, "Asi es mi Tierra" roughly "That's how my land is."
Sinaloa state prosecutors said two men walked into the station Saturday and asked for Roman Tirado. One of the men waited outside the studio where Roman Tirado was broadcasting while the other walked into the studio and shot him.
"They violently forced their way in," Ontiveros said. "They asked for Atilano. The receptionist said he was there and said if they waited, she would tell him they wanted to see him," Ontiveros said. "But they pushed open the door and forced their way in to the studios."
Sinaloa Gov Mario Lopez Valdez said that the killing would not go unpunished, but officials had reported no arrests on Monday. State prosecutor Marco Antonio Higuera said the station offices did not have security cameras that might have recorded the killing.