Officers on Tuesday morning descended on the Nairobi residence of Garissa Governor Ali Korane over the cold-blood shooting of the county's former finance executive.
Mr Muhktar was shot by unidentified gunmen when he was on his way home after prayers.
The dramatic arrest of the governor has sparked questions about what he may know that will help in the investigations.
One of the questions that the governor will have to answer will regard his relationship with the former county executive.
In investigations into assassinations or assassination attempts, the relationship between suspects and victims is usually explored.
Another question that the governor will have to answer is what led to the former cec leaving his job as finance executive.
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