In a statement, the DCI said the arrests were made in a coordinated operation spanning Nairobi and the Ugandan capital, executed by a specialised team drawn from the Crime Research and Intelligence Bureau, the Operations Directorate and the Homicide Bureau at DCI Headquarters.
Acting on forensic analysis, detectives traced two of the suspects to Kyanja Heights flats in the Nakawa suburb of Kampala, where they were arrested with the help of the Uganda Police Force.
The DCI identified them as Police Constable Bett Kiplangat Collins, service number 118491, attached to Thogoto Police Station, and Pius Muiru Mbugua, a civilian.
The agency said the two had sneaked into Uganda illegally after the murder. They are being held at Jinja Road Police Station pending an escorted return to Nairobi.
A third suspect, Samuel Karanja Gathoni, who the DCI says also goes by the alias “Lawyer”, was intercepted earlier by the same team within the Langata Multi-Media area as he headed towards Ongata Rongai.
According to the DCI, investigations have established that PC Bett was tasked with surveillance and acted as co-driver to Daniel Mwangi Njoroge, described by detectives as a central organiser of the operation and the driver of a Land Cruiser Prado registration number KDH 600A.
That vehicle, the agency says, was used to box in the Uber in which Dr Mutiso was travelling on the morning of 29 July 2026 in Upper Hill, Nairobi, moments before she was fatally shot.
Detectives further allege that Mbugua served as the link between the execution team and the person who contracted it, acting as paymaster and moving money for logistics and the movement of the hit squad.
The National Police Service acknowledged the support of the Uganda Police Force, saying its cooperation made the raid, the arrests and the secure detention of the suspects possible.
The DCI said the suspects held in Uganda are being prepared for escort back to Kenya, where all three will be processed and arraigned in accordance with the law.
The agency used the statement to hit back at what it termed reckless and unsubstantiated claims by political actors over the handling of the case, specifically rejecting assertions that suspects had been quietly arrested and released, or that security officials had facilitated their escape.
The DCI dismissed those claims as false and said they were calculated to shake public trust and cast detectives as accomplices rather than pursuers.
