The United Democratic Alliance (UDA) candidate John Njuguna Wanjiku has won the Kiambaa parliamentary Mini-poll.
Njuguna overcame stiff competition from Jubilee Party candidate Njama Kariri to emerge victorious with 21,773 votes.
Kariri garnered 21,263 votes in a contest that went down to the wire.
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The race saw eight parliamentary candidates fighting to replace Paul Koinange, who died in March.
Earlier on Friday, vote tallying was briefly suspended after Njama and his supporters claimed that the ballots were being rigged in favour of Mr Wanjiku.
Chaos erupted after Wanjiku made an early lead with 21,401 against his closest rival Njama who had 21,057 votes.
Tallying of votes resumed after police restored order.