BJD's Pratyusha Rajeswari Singh, widow of former MP Hemendra Chandra Singh, had filed her nomination papers yesterday. Hemendra's death on September 5 necessitated the bypoll.
"A total number of nine candidates have filed nominations for the bye-election," an EC official said.
Ray, who represented Kandhamal parliamentary seat from 2009 to 2014 as a BJD MP, had recently joined BJP and was given a party ticket to contest the election.
Former Phulbani MLA and Congress nominee Abhimanyu Behera filed his papers today with his party putting up a show of unity in the district.
"Now we are one and united. This is one of the happiest moments. We will unitedly fight the elections and we are sure to win," Jena said.