An autopsy determined she died from multiple "sharp force" injuries, officials said Friday.
The video in the player above is from a previous report.
Her body was found early Wednesday near the extended-stay hotel off Landmeier and Higgins Road, police said.
Police believe this is an isolated incident, and there is no threat to the community.
The woman's identity has not yet been released.
She was found dead just after 4:15 a.m. Wednesday. Investigators spent most of the day processing the scene.
Elk Grove Village police called the death suspicious at the time, but assured the public it was an isolated incident.
"I just freaked and I couldn't believe it," said Eva Wypych, who was staying at a nearby hotel. "I saw body covered with the blanket."
Wypych is staying at the hotel off Landmeier and Higgins Road and says she saw the body and investigators on the scene as soon as she stepped out for her early morning walk.
The Major Case Assistance Team responded alongside police. Investigators were seen going through dumpsters near the hotel, collecting multiple bags of evidence.
Wypych said hotel guests have heard reports of what may have played out, but so far investigators have not released details on the woman's death.
"This, it just breaks my heart. People should love one another, care for one another," Wypych said. "Nobody deserved that. We all created by God, and only God could take you."
Police have not said if she was staying at the hotel, but did say so far no one is in custody.