Singh won 36.13% of the votes in the constituency, but was defeated by Sahana Pradhan of the Communist Party of Nepal (United Marxist-Leninist) (CPN(UML)).

Singh, along with Sher Bahadur Deuba, were accused by the RCCC of involvement in a case of corruption relating to the Melamchi Drinking Water Project.

Singh was released from jail on February 13, 2006, as the Supreme Court of Nepal ordered the dissolution of the RCCC.

[12][13] After the fall of King Gyanendra's direct rule, Singh became a nominated member of the new interim legislature.

[19] He was able to garner nearly 7% voters opening the way for second round of election as Deuba who obtained 48% votes was unable to cross 50% mark even joining hands with leader Krishna Prasad Sitaula.