Kenya's Supreme Court will hold a last-minute hearing to decide whether the re-run of the presidential election can go ahead.
In the western city of Kisumu, around 2,000 demonstrators marched on the election board offices, witnesses said, heeding Raila Odinga's appeal for protests against Thursday's repeat presidential ballot, before dispersing peacefully. Njoroge said one person shouted "finish him" and they shot him in the mouth and twice in the chest before fleeing with the officer's gun.
The government has declared Wednesday, October 25 a public holiday.
Incumbent President Kenyatta emerged victor of the August election but a ruling by Kenyan Supreme Court annulled the outcome of the election over what it deemed clear illegalities and irregularities in the conduct of the election.
Chief Justice David Maraga said in September attempts to intimidate Kenya's Supreme Court judges after they nullified President Uhuru Kenyatta's re-election have been "unlawful and savage in nature".
According to the legislator's lawyer Kibe Mungai, he is taking the dispute to the Supreme Court.
President Uhuru Kenyatta, who was declared the victor in the August vote, wants to press ahead with Thursday's election despite concerns about its credibility.
IEBC chairman Wafula Chebukati's announcement that the election may not be credible has fulled calls that the exercise should be cancelled.
The MP said he is apprehensive that there is political conspiracy to prevent the Independent Electoral and Boundaries Commission (IEBC), as presently established, from conducting the fresh presidential elections.
One key case, brought by human rights activist Khelef Khalifa and two others, seeks to delay the vote on grounds that the election board is not sufficiently prepared.
The Judge acknowledged that there is an active and critical ongoing presidential process in the country and if Pkosing's orders are granted, the court will be going overboard in determining the question of validity of the same process way beyond its jurisdiction.