
Last week, the court dropped charges against Manoch Hinkaew, 42, and his 71-year-old father Jua Hinkaew on grounds of weak evidence, while handing down a death sentence to Manoch's elder brother Thanu Hinkaew.
Jua was a former kamnan of Tambon Bo Nok in Prachuap Khiri Khan. He is in detention pending appeal.
Charoen was gunned down reportedly because he led a protest against the construction of a power plant in Tambon Bo Nok. If the construction had gone ahead, Jua would have enjoyed huge profits.
Today, Charoen's wife Korn-uma Pongnoi is leading the protest against the power-plant construction.
Accompanied by 200 supporters, she called on Seksan Bansombooon - an executive director at the Office of the Attorney General - to file a complaint about the court's decision to clear Jua and Manoch of the charges.
Korn-uma also wanted public prosecutors to oppose any move for Jua's temporary release.
Seksan promised to look carefully into the case.