The taxi driver linked to the murder of Mildred Odira, a 32-year-old switchboard operator for Foresight Company based at Nation Centre, has been released.
David Junga Ochieng, the only suspect in the case, was freed after senior state counsel Christine Mbevi said police did not have sufficient evidence to charge him with murder.
When the case was mentioned on Wednesday, Ms Mbevi informed Kiambu Chief Magistrate Patricia Gichohi that that police will now treat Mr Ochieng as a possible prosecution witness.
The magistrate allowed the prosecution to close Mr Ochieng's investigation file and ordered the return of the Sh200,000 cash bail he deposited.
Ms Odira was last seen leaving her home in Kariobangi South, Nairobi, on January 29.