Senior police officials remained tight-lipped about the outcome of the autopsy, saying the final report will come in a couple of days, but sources said initial report suggested that Rakhi died of the injuries on her body apparently caused by beating.
Her body had burn marks and injuries on the chest, stomach, arms and legs.
Police is also making efforts to determine the exact age of the juvenile domestic help, who is a victim and a complainant in the case.
Another police team is camping in Kolkata to bust the human trafficking trail through which Rakhi and another maid Meena were brought to the MP's house here from West Bengal.
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Rakhi died allegedly of the torture inflicted on her by Jagriti, while Meena had been severely injured and is at present undergoing treatment at R M L Hospital here, police said.
According to police, Dhananjay Singh had contacted Dev Kumar, who had got these two women employed at his house as domestic maids.
The body of Rakhi, with several injury marks on her legs, chest and arms, was recovered from Singh's residence at South Avenue here on Monday evening.
The juvenile help had told police that Jagriti had been regularly beating the three domestic helps.
The domestic helps were allegedly tortured and beaten up with wooden sticks, iron rods, iron press and even metallic deer horns by the accused.