"I have already sent my resignation to the BJD president and chief minister Naveen Patnaik. I have thanked the party president for the cooperation I enjoyed during my tenure as an MLA," Singh told reporters.
Singh was elected from the Khandapada Assembly segment in 2009 and remained a member of Odisha Legislative Assembly till 2014.
However, he was not given party ticket in 2014 and was replaced by Anubhav Patnaik.
"I have never taken up any anti-party activities all along," Singh said in the letter to Patnaik, adding that he had sincerely worked for the BJD during by-elections in Kandhamal Lok Sabha segment last year.
