Rajya Sabha MP and former Samajwadi Party (SP) leader Amar Singh died at a Singapore hospital on Saturday.

According to reports, the Rajya Sabha MP was undergoing treatment at the hospital for several months and was admitted to the intensive care unit of the hospital.

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Prime Minister Narendra Modi has expressed condolence at the demise of Singh.

“Amar Singh Ji was an energetic public figure. In the last few decades, he witnessed some of the major political developments from close quarters. He was known for his friendships across many spheres of life. Saddened by his demise. Condolences to his friends & family. Om Shanti,” PM Modi tweeted.

Earlier on Saturday, Singh offered a tribute to freedom fighter and educationist Bal Gangadhar Tilak on his death anniversary.

“Tribute to the great revolutionary freedom fighter Lokmanya #BalGangadharTilak ji on his death anniversary. His contribution will be remembered forever,” Singh said in the tweet at 2.09 pm on Saturday.

In another tweet on the day, Singh wished Eid Al Adha to all his followers.

“Wishing a very joyous Eid Al Adha. Let’s celebrate this day by spreading love and happiness,” Singh tweeted at 2.04 pm.

Singh fainted at Dubai airport in February 2013 on his way to Singapore for a regular medical check-up.

He was treated in a Singapore hospital for a kidney ailment some years before that incident.

On January 6, 2010, Singh, who was once considered Samajwadi Party chief chief Mulayam Singh’s close confidante, resigned from all positions in the party.

He was later expelled from the party.

In 2011, Singh formed a new political party – Rashtriya Lok Manch – and fielded candidates in UP Assembly polls in 2012 but failed to succeed.

Singh joined the Rashtriya Lok Dal, led by Jat leader Ajit Singh, in 2014.

During his decades-long political career, Singh was part of a number of parliamentary committees.