Rakhi's son was in Delhi on Thursday but went missing after he went for dinner at night.
Police said on Thursday evening he went to eat with an acquaintance from Gurgaon and has since switched off his phone.
Police feels he might have been unnerved by the developments.
Cops have also tried to touch base with the boy's father to take her body
Rakhi's body will be kept in the RML mortuary for 7 days and would be buried by the authorities after that
Police say the foster son had no role in the investigation. The body was identified by the minor servant .
The foster son is neither the complainant , nor a witness, police said.
