The election was held in the 10 local government areas that make up the district.
The winner, who is the younger brother of the late Senator Isiaka Adeleke, had 97,480 votes to defeat a former senator, Mudashiru Hussein, of the All Progressives Congress, who had 66,116 votes,
Announcing the result in Iwo, the Osun West Senatorial District headquarters, Baritor Kpagih, the INEC Residential Electoral Commissioner for the bye-election, said Adeleke won in nine out of the 10 local government areas where the election was held.
Kpagih consequently returned Adeleke as senator to complete the tenure of the late Adeleke, who died on April 23.
He gave the breakdown of the election results in the 10 local government areas as follows:
Adeleke would represent the senatorial district till 2019 when another election would be conducted.