Safaricom Presents Isaiah Murangiri Call Data Evidence in Rex Masai Murder Trial
The trial of Rex Kanyike Masai who was killed during the anti-finance bill protests continued on Monday September 15, 2025 with fresh evidence presented before Milimani Law Courts.
Before Principal Magistrate Geoffrey Onsarigo, Safaricom’s senior manager and law enforcement liaison officer Zachary Mburu submitted mobile call data records that investigators believe will shed light on the movements of the key suspect police officer Corporal Isaiah Murangiri Ndumba.
According to Mburu, Safaricom received court orders to provide call data for three mobile numbers covering June 18 and June 19, 2024. From the extracted records, two numbers were registered under Ndumba, one under Benson Kamau and another under Micheal Oginga Okelo.
“In terms of registration particulars we established through extraction that 0715* is registered under Benson Kamau and 0728* is registered under Isaiah Murangiri Ndumba,” Mburu testified. He further revealed that another number 0746* was also linked to Ndumba while 0704* was under Okelo. However Okelo’s number had no call activity during the specified dates.
The Safaricom officer explained that Ndumba’s two lines had call data on June 18, 2024 but no activity on June 19. Notably the records showed that on June 20, 2024 Ndumba’s number was active within Nairobi’s Central Business District (CBD).
“On June 20, 2024 for Isaiah Murangiri number 0728 he was serviced by St. Elis until 1945 hours then by Kencom site and again at 2011 hours by St. Elis site,” Mburu told the court. “This means he was in that vicinity on that day.”
This comes just weeks after the trial took an unexpected turn on September 1, 2025 when a police witness failed to positively identify Ndumba in photographs presented as evidence.
During cross-examination Law Society of Kenya (LSK) lawyer David Mwangi asked Mburu if a mobile number can remain active in Safaricom’s system even if the registered owner had stopped using it a year earlier.“We were told here in court by a person named Isaiah Murangiri who your data shows is the owner of the same phone number that he had stopped using this phone number. Is it possible for this line not to have been used by the registered owner and yet still be active a year later?” Mwangi asked.
Mburu however declined to give further technical explanations beyond what was presented in the records.
The case continues.
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Safaricom Presents Isaiah Murangiri Call Data Evidence in Rex Masai Murder Trial