An unidentified man posing as a courier delivery person stabbed a senior citizen when she was alone at her Chembur residence yesterday afternoon.

The assailant showed up at the home of Anusaya Dhyani (72) claiming to be delivering a package. The woman had the chain-lock in place and the assailant convinced her to open the door to sign for the package. When Dhyani fell for the ruse, the man grabbed her by the neck and stabbed her in the abdomen.