Independent candidate Rup Narayan Chamling Tuesday won the assembly by-poll from Rangang-Yangang assembly constituency in Sikkim.
"He (Chamling) won the by-poll by a margin of 706 votes," said an election officer of Sikkim.
The bypoll was necessitated after Chief Minister Pawan Chamling resigned from the seat and retained Namchi-Singhithang after the April assembly elections.
Rup Narayan Chamling defeated Sikkim Democratic Front (SDF) candidate Kumari Manger, Bharatiya Janata Party's (BJP) Bikash Basnet, and the Congress's Bishnu Prasad Adhikari.
The Sikkim Krantikari Morcha opted out of the fray this time.
R.N. Chamling is brother of Chief Minister Pawan Chamling.
