Rajya Sabha leader Amar Singh died in Singapore on Saturday where he was undergoing treatment. He was 64. Singh had been diagnosed with a kidney ailment in 2009 and was undergoing treatment at a hospital in Singapore for the past few months.

“Saddened to know about the death of senior leader and parliamentarian Amar Singh,” Defence Minister Rajnath Singh tweeted.

Earlier in the day, the former Samajwadi leader had posted messages on Twitter, paying tributes to Bal Gangadhar Tilak on his 100th death anniversary and also wishing people on Eid.

Rajya Sabha MP Subramanian Swamy offered his condolences to the former Samajwadi party leader. “Amar Singh MP and a person I have known for long, died today. Although he was mostly with SP, but he made friends across the spectrum of political parties. My condolences to his family,” the BJP leader has tweeted.

Singh had served as the general secretary of the Samajwadi Party and was said to have been close to party founder Mulayam Singh Yadav. In 2010, Singh had resigned from all posts and had been expelled from the party soon after.

Despite the falling out, Mulayam Singh again elected him to Rajya Sabha in 2016 amid stiff opposition from a section of the party, including the then Chief Minister of Uttar Pradesh Akhilesh Yadav. He was also reinstated as one of the general secretary of the party in October 2016.