Prosecutors say a Chicago police officer was fatally stabbed by her 15-year-old grandson after she caught him skipping school.

Keshawn Perkins is charged as an adult with first-degree murder and armed robbery in the death of 55-year-old Hester Scott. Scott, an officer for 25 years, had adopted Perkins.

The teen was denied bond Sunday and didn't comment in court. He has a public defender, but the Cook County public defender's office was closed Sunday and not accepting calls.

Prosecutors say Perkins had skipped school and was sleeping when his grandmother caught him. Investigators allege that the teen stabbed Scott with a kitchen knife, took her purse, wrapped her body in a blanket and dumped it in the backyard.

Scott's body was found Friday in a sewer trap behind her home.