According to Masaba North Sub-County Police Commander Robert Ndambili, the suspect had executed the murder in a manner that left no footprints of the crime.
"The criminals had ensured they have left no evidence that could help in unraveling the murder. They had even taken away the family's closed-circuit television video recorders," Ndambili said.
The DCI said they received information about the suspect four days ago before they laid a trap after trailing him.
"The suspect had been spotted in Ruai where he had gone into hiding after the incident. The officers moved with speed and as they were closing in on him, he slipped their dragnet. But unknown to him, the determined sleuths had trailed him waiting for the right moment to strike," the DCI wrote on its Twitter.
According to the directorate, the sleuths posing as hawkers along the border struck as the suspect tried to cross over to Tanzania.
The DCI said a two months of thorough scrutiny, research, and analysis by the Crime Research and Intelligence Bureau and the Cyber Forensics team from the DCI's National Forensic Laboratory had actively placed the suspect at the scene of the murder on the night of the attack.
The suspect is also believed to be behind a spate of reported robbery with violence and murder incidents in Nairobi, Nyamira, Kisii, and Migori counties.
So far, 3 more suspects have been arrested in connection with the couple's murder.
Ondara is being held by the detectives ahead of his arraignment in court on Monday.