Delhi: Prominent Indian politician Shashi Tharoor has been questioned in connection with the 2014 murder of his wife, police say.

Sunanda Pushkar, 51, was found dead at a luxury hotel in January 2014.

In this photo from 2012, Shashi Tharoor and his late wife, Sunanda Pushkar, arrive at parliament. Credit:AFP

Police this month said she was poisoned and opened a murder investigation against unnamed suspects.

Mr Tharoor, an opposition member of parliament and former UN diplomat, was questioned for four hours in Delhi late on Monday, city police chief BS Bassi said.