The security guard, who was pronounced dead at Radiant Hospital, was identified as John Walumbengo, 32.
After the shooting incident, the police officer escaped from the scene of crime.
But he was traced to his rented house in Umoja Estate in Ngegu Location within Kiambu town.
He will be arraigned Friday in Kiambu.
An agitated man who would have easily killed again if provoked is how Kiambu Deputy OCPD George Osur described Githunguri MP Gabriel Kago's bodyguard, who shot and killed an innocent security guard at an entertainment joint in Kiambu on Wednesday night.
Mr Osur told the Nation Thursday that the suspect, according to police investigations, is an Administration Police officer identified as Corporal Daniel Kinyanjui Wainaina, who had gone to Riseside Club a few minutes to 2am demanding to be let in to buy beer. When he was informed that the facility had closed, he drew his gun and shot the guard at close range. The man later succumbed to the gunshot injuries.
