Police suspect the girl, aged around 15-16 years, was raped before being killed.
The body of the teenager was today found lying on a plot in Aman Garden colony of Elaichi Pur area here, SHO Ummed Yadav said.
Her head was battered by stone, he said, adding a blood stained stone has been recovered from the site.
The autopsy report is awaited to ascertain the exact cause of death, the SHO said.
Police are trying to establish her identity and further probe is on, he said.