Hyderabad, Aug. 14 -- A 48-year-old school principal was stabbed to death by unidentified people at her residence in Telangana's Nalgonda district, police said, adding that people known to the victim might have killed her.

The incident happened at JB Colony of Kondamallepally mandal headquarters on Wednesday. The deceased was identified as Kallu Roopa Reddy, 48, principal and director of Nagarjuna Grammar English Medium School in Kondamallepally.

According to the police, Roopa Reddy had gone to Hyderabad with her husband Kallu Rajender Reddy during the three-day holiday beginning Saturday. As Rajender Reddy had some work in Hyderabad, she returned alone to Kondamallepally on Tuesday morning and attended school.

"She remained at the sch...