Singh (74), the wife of former Kerala governor Nikhil Kumar, died during treatment at a Delhi hospital in the early hours. She was also the daughter-in-law of former Bihar chief minister Satyendra Narayan Sinha.
Singh entered Parliament in 1999 from the Aurangabad Lok Sabha seat of Bihar. She was also the vice president of Bihar Congress.
Her father was an ICS officer while her mother Madhuri Singh was a former MP.
Congress President Sonia Gandhi has expressed deep condolences on the passing away of the senior party leader and conveyed her sympathies to her husband and her family.
Congress Vice President Rahul Gandhi, who is away to the United States, also condoled her death.
"My condolences to the family of former Parliamentarian and senior Congress leader Smt Shyama Singh ji on her demise," he said on Twitter.
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