The High Court has directed ODM to nominate a candidate for the Muhoroni MP seat within 72 hours.
Justice Jessi Lessit set aside a ruling by the Political Parties Tribunal upholding Onyango K'Oyoo's win in the recent party primaries.
An appeal was filed by former MP Ayiecho Olweny after he was dissatisfied with the tribunal's findings.
Olweny had lodged a complaint at the tribunal saying that voting did not take place in five wards and the returning officer had gone missing, therefore results could not be declared.
The tribunal ruled that Olweny's complaints lacked merit and dismissed it.
K'Oyoo had been declared winner with 18,669 votes, while Olweny got 6,648 votes.
In the 2013 polls, K'Oyoo was denied the ODM ticket and opted for People's Democratic Party (PDP) through which he won the seat.
At that time, Prof Olweny was handed the certificate but lost in the March 4, 2013 general election.
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