Besides 35-year-old maid Rakhi, who was allegedly beaten to death and a minor help physically abused by Jagriti, "inhuman treatment" of a third maid has come to light, they said.
The third maid has been identified as Meena (38) and a native of 24 North Parganas in West Bengal, like Rakhi. She had also been severely injured and is at present undergoing treatment at R M L Hospital here, said police.
Police will record Meena's statement under Section 164 CRPC.
"We came to know to about her last evening and found her at Dhananjay's brother-in-law house. Her back and other parts of the body have been burnt by hot iron. She was also beaten up in an inhuman manner and and she cannot even sit," said a senior police officer.
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Meena has been working at Jagriti's residence at South Avenue since November 2012.
Dhananjay and his wife Jagriti were arrested yesterday in connection with the murder of Rakhi and "merciless" torture of another 17-year-old minor domestic help with stick and rods.
The juvenile help, who is the complainant in the case, had told police that Jagriti had been regularly beating the three domestic helps.
The domestic helps were allegedly tortured and beaten up by wooden sticks, iron rods, iron press and even metallic deer horns by the accused.
Rakhi, a Bangladeshi migrant, had been working at the MP's residence for the last 10 months. Although Jagriti was torturing Rakhi for the past many months, the frequency of beating had gone up since November 1.