Kenyan prosecutors secured a conviction against former Migori Governor Okoth Obado last month using M-Pesa records, mobile phone data and vehicle tracking instead of eyewitnesses — a transformation that's reshaping how the country's justice system handles complex murder cases. When prosecutors opened the murder trial over the death of teacher and blogger Albert Ojwang last month, they didn't lead with witness testimony. They played hours of CCTV footage from inside Nairobi's Central Police Station, tracking the movements of former OCS Samson Tallam and five other defendants through Ojwang's final hours. The recordings placed each suspect at critical locations before Ojwang was found dead, forming the backbone of the prosecution's case.
From Confessions to Data Trails
This shift away from eyewitness testimony and confessions toward hard digital evidence marks a fundamental change in Kenya's criminal justice system. Investigators now routinely deploy CCTV footage, mobile phone data, DNA analysis, geospatial mapping, M-Pesa transactions, digital photographs and forensic examination of electronic devices to reconstruct crime scenes and establish timelines. The tools allow detectives to trace suspects' movements and corroborate witness testimony with objective data that's harder to dispute in court.
The Obado conviction demonstrates how digital evidence can strengthen circumstantial cases. No witness saw Sharon Otieno being killed in 2018, but prosecutors presented mobile phone evidence, digital records and vehicle tracking data alongside testimony from 42 witnesses to reconstruct the conspiracy. Justice Cecilia Githua found that Obado's former PA Michael Oyamo had deliberately acquired an Airtel line using a stolen identity card shortly before the murder, intending to conceal his identity when communicating with Sharon. M-Pesa records showed money flowing from Obado to Sharon as he tried to persuade her not to reveal their relationship or her pregnancy. Investigators established that Sharon and the journalist with her were instructed to switch off their mobile phones just before they were driven away, preventing tracking. The vehicle used had its tracking device disabled on the day of Sharon's abduction.
Forensic Reconstruction
Justice Githua said disabling the tracking system was evidence of planning and an attempt to conceal movements. She concluded that Obado financed the plot, Oyamo coordinated its execution and former county officer Caspal Obiero helped cover it up. DNA tests on the fetus confirmed Obado was the biological father. The court held that digital evidence, alongside witness testimony and other circumstantial evidence, formed an unbroken chain pointing to the guilt of all three accused.
The ongoing inquest into the death of Rex Kanyike Masai, shot during anti-Finance Bill protests on June 20, 2024, will also heavily rely on CCTV footage, forensic video analysis and mobile phone triangulation. The National Police Service persuaded the court to allow fresh testimony from witnesses who'd already testified, despite opposition from the Independent Policing Oversight Authority. The NPS was allowed to recall representatives from the Integrated Command, Control and Communication Centre, Absa Bank, International Life House and Bliss Hospital, whose evidence is expected to shed light on CCTV footage and the sequence of events during the protests.
IPOA's lead investigator, Justin Nyatete, said the investigation faced attempts to frustrate the probe, including misleading information from key police officers, missing deployment records and alleged interference with the arms movement register at Central Police Station. Forensic video analysis of CCTV footage and photographs identified an armed undercover officer in civilian clothing at Moi Avenue and Mama Ngina Street. Nyatete said the officer's facial features, distinctive birthmark, clothing and accessories matched those of Police Constable Isaiah Murangiri Ndumba. IPOA obtained Murangiri's registered mobile phone numbers from Safaricom after he allegedly provided investigators with a number belonging to another person. Phone records, metadata and cell-site triangulation placed his handset in the CBD and near the protest route around the time Rex was shot.
High-Profile Cases Solved
Technology proved decisive in solving the murder case involving former Kenya Air Force Major Peter Mwaura Mugure, recently sentenced to life imprisonment for murdering Joyce Syombua and their two children. M-Pesa records showed Mugure had sent Joyce money to facilitate her journey from Nairobi to Nanyuki with the children days before they disappeared. Mobile phone records later placed Joyce and the children inside the military base after they arrived. Experts extracted data from mobile phones belonging to the victims and witnesses, helping investigators reconstruct their movements before the killings. Messages deleted from Mugure's phone, a recovered SIM card and digital records all corroborated witness testimony. DNA analysis confirmed the children's paternity, providing prosecutors with a compelling motive. Justice Martin Muya concluded that the combination of witness testimony, digital evidence and forensic analysis proved the murders had been meticulously planned.
In the prosecution of Joseph Irungu, alias Jowie, convicted of murdering businesswoman Monica Kimani, investigators reconstructed Kimani's final journey using airport surveillance systems. Passenger records established that she travelled from Juba aboard a Kenya Airways flight on September 19, 2018. CCTV footage from JKIA tracked her movements from the aircraft to immigration, the baggage hall and finally to the taxi rank, where she boarded a cab to her apartment in Nairobi. A Safaricom data analyst produced evidence showing that Irungu had communicated with Kimani weeks before her death, contradicting his claim that he didn't know her. The court viewed a video recovered from Irungu's mobile phone showing him inside Kimani's house before her murder.
The murder trial of lawyer Willie Kimani, his client Josephat Mwenda and taxi driver Joseph Muiruri, who disappeared after leaving Mavoko Law Courts on June 23, 2016, relied on an extensive trail of digital evidence. Justice Jessie Lesiit considered more than 6,100 pages of documents, 117 exhibits and evidence from 80 witnesses. CCTV recordings and car tracking data showed Kimani being picked up by taxi driver Muiruri in Westlands before travelling to Mavoko Law Courts. Police communication records traced the movement of radio equipment used by officers implicated in the killings, placing the devices at several locations including near the site where the victims were murdered and their bodies stashed. Former AP officer Fredrick Leliman was sentenced to death, while his former colleagues Stephen Cheburet and Sylvia Wanjiku received 30 and 24 years in prison, respectively.
As the investigation into the murder of Dr Victoria Mutiso continues, detectives are pursuing several lines of inquiry following the July 29 shooting. They're following various leads, including forensic analysis of CCTV footage and call data records. So far, at least eight suspects have been named, including three police officers.
Why This Matters:
The shift toward digital evidence in Kenya's criminal justice system represents a fundamental improvement in the reliability and integrity of murder prosecutions. Traditional reliance on eyewitness testimony and confessions created vulnerabilities to coercion, intimidation and simple human error. Digital evidence — M-Pesa transactions, CCTV footage, mobile phone records, DNA analysis — provides objective documentation that's harder to manipulate or dispute. This technological transformation strengthens the rule of law by making it more difficult for powerful individuals to evade accountability through witness intimidation or corruption. The Obado conviction demonstrates that even a sitting governor can't escape justice when prosecutors build cases on verifiable digital trails rather than testimony that can be threatened or bought. For investors and businesses evaluating Kenya's institutional stability, the justice system's adoption of modern forensic tools signals a maturing legal framework that can protect property rights and enforce contracts with greater reliability. The technology also imposes accountability on law enforcement itself, as the Rex Masai inquest shows — CCTV footage and mobile phone data can expose police misconduct just as effectively as they can solve civilian crimes.