Revealed: How Dr Mutiso's murder suspects are plotting to poison police informers

Detectives say one of Mbithe and her children’s close associates was arrested at Pangani Police Station while carrying poisoned food allegedly for a person who had been cooperating with police.

Rose Mbithe Mulwa and her two children have now been linked to an alleged plot to poison suspects who are cooperating with investigators probing the murder of Dr Victoria Mutiso.

The chilling allegation is contained in a prosecution affidavit opposing bail filed before the High Court for Mbithe, her son Chris Mulwa and daughter Angela Mulwa, who are facing murder charges alongside two other suspects.

In the affidavit, detectives claim the alleged plot came to light after one of Mbithe and her children’s close associates was arrested at Pangani Police Station last month while carrying food allegedly intended for a person who had been cooperating with the investigation.

Homicide investigator Corporal Romana Odour said police received intelligence on August 20, 2026, that there was a plan to eliminate suspects who had agreed to assist the detectives.

“On August 20, 2026, we learnt through human intelligence of plans by the 1st, 2nd, 3rd and 4th accused persons (being Mbithe, Chris, Angela and police officer Elijah Kibelion) and their accomplices out at large to eliminate by poisoning some of our suspects who had opted to co-operate,” Odour said in the affidavit.

Two days later, detectives arrested the fifth accused, Maritim Kimutai alias Kim, at Pangani Police Station.

The investigator says Kimutai, described as a close confidant of Mbithe and her two children, had gone to visit one of the cooperating suspects at the police station while carrying food.

“On August 22, 2026, at Pangani Police Station, we arrested the 5th respondent (Kimutai), who is a close confidant to the 1st, 2nd and 3rd accused (Mbithe, Chris and Angela) where he had gone to visit one such suspect while carrying food,” Odour states.

The arrest allegedly opened another trail for investigators, with detectives obtaining information from Kimutai’s phone.

“Information obtained from the 5th accused's telephone assisted the investigating team to trace and arrest additional accomplices who are being processed in accordance with the law,” the investigator says.

Angela Mulwa, her brother Chris Mulwa and mother Rose Mbithe are the main suspects in the murder of Dr Victoria Mutiso. [Nancy Gitonga, Standard]

The State claims the information subsequently helped detectives trace three suspects who had fled to Uganda.

The alleged poisoning plot is now one of the reasons the prosecution says Mbithe, her children and their co-accused should remain in custody pending trial.

The prosecution argues that the alleged plan demonstrates that the threat to suspects and witnesses is continuing, particularly because other alleged accomplices remain at large.

“The incident at Pangani Police Station and the intelligence received concerning the proposed harm to a cooperating suspect demonstrate an actual and continuing risk to witnesses and cooperating suspects,” Odour says.

The prosecution’s case is further bolstered by an inventory detailing what detectives recovered during searches at Mbithe’s Karen residence following her arrest.

The inventory lists several mobile phones, including an Infinix, eight Samsung phones, Huawei, Oppo and Tecno phones, as well as a small black Samsung handset belonging to Mbithe and her son Chris.

One of the Samsung phones was identified as belonging to Angela Mulwa.

Detectives also recovered Airtel SIM cards allegedly used to communicate with other accused persons and suspects still at large.

Among the material recovered were two black-and-red notebooks containing vehicle details, including references to the Uber vehicle registration number KDJ 609D, the vehicle in which Dr Mutiso was travelling when she was killed.

A handwritten piece of paper also contained vehicle registration details, including “KDT 172 C Silver”, “KBT 935 T Black” and “KDD 958”.

The inventory further lists several pieces of paper containing numerous telephone numbers, most of them Airtel numbers and SIM cards, which the state says were used to communicate with other accused persons and the suspects at large.

Police also recovered photographs of Dr Mutiso, her husband, daughter and former security guard, alongside the original and a copy of her husband’s national identity card at Mbithe's house in Karen.

Detectives further recovered a motor vehicle taken from Mutiso's Mlolongo home, which had been vandalised during an eviction conducted in February this year at her stepdaughter Angela's residence in Kerarapon.

Information obtained from the suspects assisted the investigating team to trace and arrest additional accomplices who are being processed in accordance with the law

"Investigations further established that she was in irregular communication with Inspector Sang, a police officer and suspect who remains at large," DCI detective Odour says.

The prosecution alleges the suspects subsequently took steps to conceal their involvement and destroy evidence.

“After the offence, the accused persons and their accomplices dispersed and took steps to conceal their association and destroy or dispose of evidence,” Odour states.

The investigator further alleges that material digital and telecommunications footprints were erased.

Further, officer Kibelion, who was attached to Karinde police post, is alleged to be the person who discharged the fatal shot and that the DCI have credible evidence that he destroyed evidence by burning the clothes he had worn during the shooting in an effort to eliminate physical or forensic evidence before he fled.

The prosecution says some witnesses are under the protection of the Witness Protection Agency and argues that releasing the accused persons could expose them and their families to intimidation or interference.

The State is therefore asking the High Court to deny bail, arguing that the alleged poisoning plan, the recovery of electronic devices and the continued pursuit of suspects at large point to an ongoing risk of interference with the investigation.

Further, the DCI detectives reveal that investigations established that the murder of Mutiso arose against the background of a long-standing acrimonious land dispute over a 20-acre property in Mlolongo which pitted the deceased and her husband against Mbithe and her two children, Chris and Angela.

"Mbithe and her two children were the core planners who identified the deceased and her family as the targets and supplied the targets' personal information concerning them. Additionally, the three accused persons built and financed a chain of command which included officers Kibelion and Kimutai, among others who possess intermediaries, handlers and undercover contacts in the execution of the murder," detective Odour says

The affidavit opposing bail by the DPP and DCI comes after the five suspects denied murder charges before High Court judge Alexander Muteti on Tuesday afternoon.

The suspects will remain in police custody until Tuesday next week.