The deceased woman, identified as Shanti Chopra, lived with her two differently-abled sons. Her husband was a hotelier, who died around two years ago.
Chopra was also former member of a national political party, a senior police official said.
A domestic help, who was recently hired by Chopra with the help of a placement agency, is the prime suspect in the case, a senior official said.
According to the police, the incident was reported around 8.30 PM. Chopra usually used to sit outside her house around that time and chat with neighbours. When she was not found sitting there today, a few neighbours went to check on her.
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The police had to break open Chopra's door and rush her to a hospital, where she was declared brought dead.
During investigation, it turned out that the back door of her house was also locked from inside. The rooms were apparently ransacked and later cash and jewellery were reported to be missing from her lockers, an official said.
The ventilator in the washroom was found open, suggesting that the murderer escaped through that.
"The police are questioning neighbours and trying to obtain CCTV grabs from nearby premises," DCP (Central) Paramaditya said.