A missing Illinois woman last seen in January has been found dead, tied up, wrapped in a sheet and dumped in a shopping cart in a Chicago alleyway, according to authorities.

Rosa Chacon was last seen on Jan. 18, getting into an Uber car headed for an address on Western Avenue in Chicago, according to the private investigator hired by her family.

Chicago police found a 21-year-old woman's remains less than 2.5 miles away from home on March 15, around 10:45 a.m. CT. She was pronounced dead at the scene and Area Four detectives launched a homicide investigation.

Chacon's cause and manner of death were still pending Tuesday morning, according to the Cook County Medical Examiner's Office.

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Her family says Chacon didn't order the Uber herself.

"I kept telling the cops, check the Uber out," her mother told FOX 32 Chicago on Friday, as members of the community gathered outside her home to release balloons on what would have been the slain woman's 22nd birthday.

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"Once you check the Uber out, they'll let you know exactly where she went, the guy who ordered the Uber, because we didn't have no information," she said. "But they kept giving us the runaround."

Chacon's family, citing exasperation with the police investigation, hired a private investigator to look into the case independently.

The private detective, Jose Richart, did not immediately respond to a request for comment.