The man who is believed to have murdered the BBC journalist in a hotel room in Nairobi before dying in a fall was her fixer.
Officials aware of the probe say Henry Timati Mauti, the Kenyan man who is suspected to be the killer of Kate Mitchell, was known to her and was helping her move around.
The man, a graduate of USIU, had studied radiography. The motive of the incident is yet to be established.
Mitchell, a British national who worked for BBC Media Action in a number of African countries, died on Friday, November 19.
Preliminary findings show the woman was stabbed before being strangled to death.
Police Monday said preliminary investigations pointed to a murder-suicide case, adding that the man whose body was found in the same Ibis Styles Hotel died from a fall.
Nairobi region police commander Augustine Nthumbi said Mauti could have killed Mitchell 42, before jumping from the window.
Detectives however said they were conducting a thorough probe and could not rule out the murder of the two.