An arrest warrant was issued on November 2, after Massachusetts State Police found the body of 31-year-old Margaret in a car at Boston’s Logan Airport Central Parking garage the night before.
Detectives have been visiting a home in Thogoto, Kiambu County, believed to be that of the suspect but did not find him.
Officials in the US had also urged the suspect to surrender.
“We urge this suspect to turn himself to authorities before he or anyone else gets hurt. We are making every effort possible to apprehend him and to begin the process of seeking justice for Margaret Mbitu and those mourning her tragic death,” Suffolk County DA Kevin Hayden said in a statement then.
US police in Whitman area said Margaret was last seen leaving work in Halifax around 11 pm on October 30.
At some point after that, investigators said she was murdered.
Margaret’s mother, Rose Mbitu, told the media in the US that her daughter was planning to break up with the suspect.
At 6.30 pm on November 1, police officers in Boston found Margaret’s car with her body inside.
US authorities are convinced of one thing—that the suspect, 40, murdered Magret, as she was affectionately known to family and close friends, before buying tickets for a 16-hour flight to Nairobi, a move detectives believe was to avoid prosecution.
The tickets, it has now emerged, were bought early on October 31 morning, just hours after Margaret’s death.
Massachusetts authorities are hoping to take advantage of Kenya’s extradition treaty with the US, which led to the conviction of two members of the notorious Akasha family on drug trafficking and other charges.
Preliminary evidence gathered from the deceased’s car indicated that the former partner was the primary suspect.
Margaret lived with her family in Whitman and worked in Boston Area Multi-Services Inc (Bamsi) in Brockton, about 7.2 kilometres away.
On October 30 night, she drove 62 kilometres to Boston Logan Airport to see the suspect.
He lived in Lowell, 80 kilometres from Margaret’s home in Whitman.
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