The Directorate of Criminal Investigations says it will investigate all people mentioned by the late businessman Jacob Juma for having threatened his life.
According to DCI boss Ndegwa Muhoro, 20 people have been identified and will be questioned as persons of interest in the ongoing probe.
So far, a woman who was with the Juma hours before his murder has already been questioned.
Among the 20, ten other have already been questioned.
On Tuesday, Muhoro said that no one will be left out since the truth must always prevail.
The late Juma had mentioned several people among them senior government officials over threats on his life.
He said the police are yet to get the motive of the killing but added that Juma’s death might have been caused by the criminal and civil suits which he was involved in.
This comes days after the widow called for the inclusion of the FBI in the murder probe.
Juma was laid to rest on Saturday at his rural home in Bungoma County.