Indian minister Shashi Tharoor - whose wife was found dead on Friday - has been taken to hospital with chest pain.
A hospital spokesman in Delhi told the BBC Mr Tharoor had been admitted in the morning and was now stable.
He is being treated at the same hospital where his wife Sunanda Pushkar's post-mortem examination is to be carried out in a few hours.
She was found dead in a Delhi hotel, following reports that the minister was having an affair.
Police have already questioned a number of hotel staff as they continue their investigation.
Indian media reports say that Mr Tharoor had initially been admitted into intensive care but was now in another ward.
The couple became embroiled in controversy over a series of Twitter messages on Wednesday that appeared to reveal he was having an affair with a Pakistani journalist.
They later insisted they were happily married, blaming "unauthorised tweets".
Mr Tharoor married Ms Pushkar, a former Dubai-based businesswoman, in 2010.
On Wednesday, messages began to appear on Mr Tharoor's Twitter account suggesting he was having an affair with journalist Mehr Tahrar.
Ms Pushkar admitted publishing the tweets, but later denied it.
She was found dead in the five-star hotel in Delhi, according to police sources.
Reports said that her husband had informed the police of her death. It was unclear how she died.
Ms Tahrar, who denied having an affair with the minister, tweeted after she heard of Ms Pushkar's death: "I'm absolutely shocked.
"This is too awful for words. So tragic I don't know what to say. Rest in peace, Sunanda."
Mr Tharoor, a former UN diplomat, was forced to resign from his first ministerial position in 2010 amid controversy over his involvement in bidding for a cricket team.
Ms Pushkar had allegedly received a free stake in the Indian Premier League franchise he was bidding for.
He was appointed minister of state for human resource development in 2012.