The MP was gunned down by unknown assailants on Wednesday, April 30 at City Mortuary roundabout.
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The nullification followed a petition filed challenging the appointments.
U.S. federal agencies said this will help in reducing what they are calling "wasteful" spending.
The changes come at a time when different appointments are being witnessed in government.
CS Murkomen has since expressed the government's commitment to crack down on the attackers.
The news was revealed by Governor Susan Kihika during an interview with a vernacular station.
The accident took place on Thursday night.
The MP was gunned down on Ngong Road, near the City Mortuary roundabout.
After announcing his intention to vie for the Presidency, the MP is on a tour to mobilise youths.
