Indian MP and former UN diplomat Shashi Tharoor has been charged with aiding his wife’s suicide in 2014.
Sunanda Pushkar's unexplained death was initially treated as suicide but police later said she had been murdered, without naming a suspect.
Police in Delhi have now charged Mr Tharoor with abetment to suicide and cruelty to his spouse.
Mr Tharoor tweeted to say he intended to "vigorously" contest the "preposterous charges" against him.
1/2 I have taken note of the filing of this preposterous charge sheet &intend to contest it vigorously. No one who knew Sunanda believes she would ever have committed suicide, let alone abetment on my part. If this is conclusion arrived at after 4+ yrs of investigation, (contd.)— Shashi Tharoor (@ShashiTharoor) May 14, 2018
2/2) it does not speak well of the methods or motivations of the Delhi Police. In oct 17, the Law Officer made a statement in the DelhiHighCourt that they have not found anything against anyone & now in 6 months they say that I have abetted a suicide. unbelievable!— Shashi Tharoor (@ShashiTharoor) May 14, 2018
Mr Tharoor, an MP with India's main opposition Congress party, married Ms Pushkar, a former Dubai-based businesswoman, in 2010. She was found dead in a five-star hotel in Delhi on 17 January 2014.
The cause of death is still unclear.
The first post-mortem report after her death suggested she may have died of a drug overdose - reports said Ms Pushkar had been on medication.
Subsequent reports since then spoke of "poisoning", "mysterious injection marks" and according to one report, a "deep bite" on her palm.
The couple became embroiled in controversy over a series of Twitter messages before Ms Pushkar's death that appeared to reveal Mr Tharoor was having an affair with a Pakistani journalist.
Ms Pushkar and Mr Tharoor later insisted they were happily married and blamed "unauthorised tweets" for causing confusion.
A career diplomat for 25 years, Mr Tharoor served as undersecretary general at the United Nations for communications and public information.
In 2007, he lost the election for the post of UN secretary-general to Ban Ki-moon, after which he announced his retirement from the United Nations.
He entered Indian politics in 2009, but 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.
What is abetment to suicide?
In Indian law, abetment to suicide means instigating someone to kill themselves. It is usually punishable by up to 10 years in prison and a fine.
That can rise to life imprisonment or even the death penalty if the deceased was under 18, suffering from mental infirmity, or in a state of intoxication. However, judges in India are only meant to impose the death penalty in cases considered "the rarest of rare".