Fire department spokesman Sergio Vasquez says firefighters found the body of Jesus Lima on Tuesday inside his car parked outside the Sultana Radio station in the city of Zacapa. He had been shot twice.
Vasquez says the 68-year-old radio reporter was about to go into work when he was killed.
Miguel Gonzales is a member of Newsroom, a non-governmental group that trains journalists in the Zacapa area. He says three journalists have been killed there this year.
Prosecutors didn't return calls seeking comment.