A missing 7-year-old Canton girl was found dead in the dumpster of her Canton apartment complex on Monday.

Jorelys Rivera disappeared from a playground at the River Ridge apartments where she lived, according to police. Results of an autopsy shows the girl died of blunt force trauma to the head after she was stabbed, beaten and raped by an unknown predator.

The girl had been playing with friends at the apartment complex on Friday when she left to get drinks for her friends and never returned. She was killed in a vacant building in the complex, according to police.

Channel 2 Actions News reports Jorelys was being watched by a teenage babysitter that day. Her two younger siblings have since been taken into state custody, according to WSBTV.com.

Law enforcement officials launched a massive search and found the body three days later while sifting through the complex’s Dumpster. Georgia Bureau of Investigation Director Vernon Keenan said authorities believe the killer lived in the apartment complex, though no suspects have been identified.

“This was a very calculated and planned crime,” Keenan said at a Tuesday news conference.

Keenan said the girl was killed in a vacant apartment of the complex. He said there are several sex offenders in the area, but they have been ruled out as suspects.