The opposition TMC's Meghalaya vice-president George B Lyngdoh resigned from the party on Saturday, citing "personal circumstances".
Lyngdoh was among the 12 Congress MLAs who joined the TMC in 2021, making it the main opposition party in the state overnight.
He fought the assembly elections, held earlier this year, on a TMC ticket from Umroi and lost.
"I hereby tender my resignation as vice-president, of TMC Meghalaya as well as president of Umroi TMC Block Committee with immediate effect," Lyngdoh said, in a letter to the party's state president Charles Pyngrope. "This decision is driven by personal circumstances," he added.
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A copy of the letter was sent to TMC's national general secretary Abhishek Banerjee as well. Lyngdoh was tipped to be the TMC's candidate for the Shillong Lok Sabha seat in the 2024 elections.
There were also speculations that he might join the ruling NPP, which he had rejected. He is the second TMC leader to leave the party.
Earlier, TMC MLA Himalaya M Shangpliang switched over to the BJP and later joined the NPP. The NPP has already announced state minister Ampareen Lyngdoh and MP Agatha K Sangma as its candidates for the Shillong and Tura Lok Sabha seats, respectively.