Former Ruaraka OCS Nahashon Mutua has been sentenced to death after he was found guilty of killing a cellmate in 2013.
High court Judge Stella Mutuku on Thursday said the prosecution has proved its case beyond reasonable doubt.
She said Koome received inhumane treatment and there is no doubt that Mutua caused his death.
In a High Court ruling by Judge Stella Mutuku in December last year, Mutua was found guilty of killing Martin Koome Imanyara, an inmate at Ruaraka police station.
He tried to frame Kevin Odhiambo, another inmate at the station, for it. Koome was a miraa trader at Baba Dogo shopping centre in Ruaraka, Nairobi.
He had returned home drunk after the day’s work and is said to have “normal” domestic squabbles with his wife.
The prosecution showed the trial court how Mutua went to great lengths to obstruct justice, even offering an Sh1 million bribe to investigators besides trying to frame Odhiambo.
The case is the first high profile conviction of an officer accused of extrajudicial killing.