According to police sources, Jagriti Singh had been allegedly torturing her maid, who was working at her residence, for the past 10 months.
The maid died early this morning due to injuries allegedly inflicted by the MP's wife, they said, adding injury marks were visible on the arms, legs and chest.
Jagriti Singh will be formally arrested once police establishes the exact cause of death after postmortem which would take place later in the day, they said, adding the MP's wife is being questioned.
Meanwhile, Dhananjay Singh, MP from Jaunpur, said that he came to know about the case today itself.
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"I have come to know about the case today itself. The police is investigating the case," he said.
"I got a call from Jagriti last night...She said the maid got hurt after falling three days ago and she died. I came and informed the police," he said.
Singh and his wife are involved in divorce proceedings for the past seven months.