Mehr was accused by Sunanda Pushkar Tharoor, the wife of India's human resources minister, of having an affair with her husband.
Last week, Sunanda posted a series of messages on her husband's Twitter account accusing him of having an affair with the Pakistani journalist. And within less than 72 hours later, she was found dead in her hotel room in Delhi. "Her death is going to haunt me for ages," said Mehr.
Sunanda accused Tarar of having a "rip roaring affair" with her husband and stalking him incessantly. She also accused Mehr of being a Pakistani spy.
An email sent to Tharoor by Tarar on July 28 supports her claim that they were just friends. "Friendship between a man and a woman will always be labelled incorrectly. And even the woman who's the love of your life will doubt your word against very circumstantial evidence," she wrote.
Tharoor later stopped following the journalist on Twitter to reassure his wife. Last week the row was reignited when Pushkar posted messages in which Tarar appears to say "I love you, Shashi Tharoor", reported The Daily Telegraph.
Tarar said: "I have no idea where she got what from, or if she made the whole thing up. Nothing she tweeted came from me. A woman I never met attacked me on Twitter, a fight began, and then she died. I'm shattered." "Shashi loved Sunanda, and he made sure she knew it," she added.