Confirming the resignation, a BJP spokesman said Singh has forwarded his resignation letter to the party's state unit president, Prabhat Jha.
The spokesman said Jha will tomorrow take a final decision on acceptance of the resignation. He said there was no question of Singh resigning as a legislator since it was an elected post.
The ruling party MLA was said to be close to Masood, who was shot dead here in August last year, as well as Zahida Pervez, the main accused in the murder case. According to CBI sources, Zahida hired killers to eliminate Masood out of jealousy, as she resented the latter's growing closeness to the BJP legislator.