The parents of a boy who was killed as security forces moved in to clear the Ratchaprasong area during the political unrest of April-May 2010 claims not enough is being done to find the people responsible for their son's death.
Pansak Srithep, 47, father of 17-year-old Samapan, who was killed during the melee on Ratchaprarop Road, said it has been draining for him and other families of those killed during the unrest to struggle to find witnesses willing to appear in court.
That job would normally be done by the Department of Special Investigation (DSI). He wants the government, who some see as coming to power because of the red-shirt protests, to do more to help, and said investigators could do more to help with the court cases.
"Media reports and circumstantial evidence could help. Four people were injured at the same spot where my son was killed. The authorities should try to get them as witnesses," Mr Pansak said.
The Yingluck Shinawatra government seemed keen to indict culprits but was not overly concerned about individual losses. It lacked the will to help, he said.
Mr Pansak said the Abhisit Vejjajiva government set up the Truth for Reconciliation Commission that tried to explain what happened and came up with some recommendations, including financial compensation of up to 7 million baht to people affected by the clashes.
"Ironically, we see little action on the issue from this government," Mr Pansak said.
"I understand the limitations of the DSI. Its officials are working on other cases as well, but if the government is keen to make progress, to see the truth come out, they should help these officials to do their work."
Samapan's mother, Sumaporn, 50, an elementary school teacher in Nonthaburi, said her family had come to terms with the fact that Samapan had gone.
The family held a private commemoration on Wednesday. Samapan was their only son.
At present, 37 cases are at the initial inquest stage.
Another 15 cases, including the death of Japanese cameraman Hiroyuki Muramoto and six deaths at Wat Pathum Wanaram, are at a stage where authorities are still determining if the security forces were responsible.
Four cases are awaiting a decision from prosecutors as to whether they will proceed, and five others, including that of Maj Gen Khattiya Sawatdiphol, known as Seh Daeng, shot dead on May 13, are still at an initial stage with the Metropolitan Police.
The United Front for Democracy against Dictatorship will mark the third anniversary of its clashes with security forces sent to disperse its occupation of the Ratchaprasong area on Sunday. Nationwide, 94 people died in the clashes.
Red-shirt splinter groups working for the release of jailed protesters will also hold an event marking the clashes at the BTS Ratchadamri station on Sunday.
The family of Kamolkate Akkahad, a medical volunteer shot dead inside Wat Pathum Wanaram, is also dismayed by the slow progress in bringing their daughter's case to court.
Payao Akkahad, Kamolkate's mother, will not join the main stage during the event on Sunday.
Instead, she will hold a religious rite for her daughter in front of Wat Pathum Wanaram.
Meanwhile, Human Rights Watch has called on the government to revoke a decision to shield military personnel from criminal prosecution for the 2010 political bloodshed.
It also urged the Yingluck government to reject a general amnesty proposal that will cover people responsible for serious human rights abuses.
"Prime Minister Yingluck should be reminded that she came to power promising justice to the victims of political violence," Human Rights Watch Asia director Brad Adams said.
Deputy Prime Minister Chalerm Yubamrung will submit a reconciliation bill which will grant an amnesty to everyone affected by political acts since 2006 to parliament on Thursday.