Former chairman of the defunct TJRC Bethuel Kiplagat has sought to be cleared over his alleged role in the 1984 Wagalla .
Kiplagat wrote to the Director of Public Prosecution to carry out fresh investigations into the matter.
Director of Criminal Investigation has started the probe following a letter from the DPP's office.
The DCI, in a letter dated August 25 to the International Center for Truth and Justice, said: "Refer to the Director of Public Prosecutions letter ODPP/CAM/4/515/(5) dates 5/4/2016 and letter from ambassador Bethuel Kiplagat requesting investigations of the above matter,"
The letter was signed by Martin Nyaguto on behalf of the DCI boss Ndegwa Muhoro.
"For the purpose of investigations, please furnish this office with a copy of the Truth, Justice and Reconciliation Commission report on the Wagalla Massacre,"
the letter reads in part.
It is not yet clear why the former top diplomat wants his name cleared at this time - three years after the TJRC report linking him to the killings was released.
But some sources told the Star that he may be preparing to be appointed to the Independent Electoral and Boundaries Commission (IEBC).
Njonjo Mue, chairman of the International Commission of Jurists-Kenya, termed the new request for investigations as "curious".
"We find it curious that Kiplagat's request
comes over three years since the publication of the report. Why now? If the request is an effort to genuinely get to the bottom of the massacre with a view of prosecuting the perpetrators, then would be welcome," he said.
"But it is yet another attempt to cleanse any suspect, then it is an abuse of process, unacceptable to the victims and the general public," Mue said.
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Kiplagat was linked him to the massacre in which hundreds were , while others were tortured during a security crackdown.
He was serving as PS Foreign Affairs ministry in former President Daniel Moi's administration at that time.
The former TJRC boss denied involvement but later conceded that he was in a delegation that toured the region then.
He also sat in the Kenya Intelligence Committee that has been adversely mentioned in planning the massacre.