Shanti Devi lived on the ground floor of her four-storey house in Shakarpur area. The incident came to light on last night after her son discovered the body lying in a pool of blood, police said today.
Her throat was slit with a sharp edged weapon.
The victim's family also lived with her, but no one was present in the house at the time of incident, said police.
Family members have alleged that Rs 23 lakh in cash was missing from the house and Devi could be a victim of a property dispute.
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The neighbours had claimed that they saw Devi walking in front of her house around 9:30pm.
"She used to walk everyday after dinner. We saw her last night too. When her son raised an alarm we called up the police," said a neighbour.
Devi had sold a property at Ram Park a few months back and kept the money at home, according to sources.