She said Brian was shot a few meters from their house along Kitengela prison road.
''I was with Brian in the morning, and he told me that he was not ready to go out for the protest; he was neither a looter nor a protester,'' said the mother.
She says, according to witnesses who saw the incident happen, the officers marched towards Kimutai, he knelt and raised his hands in surrender, but he was sprayed with bullets by the same officer.
Nyawira narrated how they carried the body from the hospital to their home, where they spent the night.
We were worried the police could interfere with the body, that's why we had no choice but to take it to our house.
Human Rights activists want a probe into the incident, and the warden to be arrested and interdicted immediately.