The United States Federal Bureau of Investigation (FBI) could be playing a part in the probe into the murder of Lawyer Willie Kimani.
The FBI is reportedly among the observers in the autopsy process alongside family representatives, the Law Society of Kenya and others.
A day after the bodies of Kimani, his client Josphat Mwenda and taxi driver Joseph Muiruri were recovered from River Athi in Ol Donyo Sabuk, the US Department of State released a statement condemning the killings.
Secretary of State John Kerry's office said that the US was closely following police investigations into the murder of the three.
The FBI's involvement in the probe was hinted in an earlier report by the New York Times which indicated that American law enforcement agents based in Nairobi had been instructed to look into the matter.
Until his brutal death, Kimani worked for a US-backed NGO, International Justice Mission (IJM), through which he was representing Mwenda in an attempted murder case against the Police.
The lawyer, his client and the taxi driver went missing after leaving the Court in Mavoko, Machakos County and their badly damaged bodies later found dumped in the river.
Their abduction and subsequent killings were linked to three Administration Police Officers based at the Syokimau station.
The three; Senior Sergeant Fredrick Leliman, Corporal Stephen Chebulet and Constable Silvia Wanjiku appeared before the court on Monday where it was ruled they be detained for 14 days until investigations are completed.
Autopsy results of the deceased began on Monday and are expected to be released by the LSK.
