Meeruben Patel, who lived with her 44-year-old son, was alone at home yesterday when unknown persons slit her throat, police said.
Some valuables were missing from the house.
Patel's son found her lying in a pool of blood when he returned home last night.
A case of robbery and murder has been registered.
While robbery seems to be the motive, police are probing other angles too, said an official.
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