The Lake County Sheriff's Office has identified the girl as 14-year-old Takaylah Tribitt.
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She was reported missing in Chicago at the end of September.
"We can confirm that, through the use of DNA technology, we have been able to identify the 14-year-old female victim as Takaylah Tribitt, of Chicago," said Lake County Sheriff Oscar Martinez Jr.
RELATED: Teen girl's body found in Gary, police seek help identifying her
Utility workers found her body in a Gary alley on September 16.
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Investigators in both Illinois and Indiana are now looking for suspects.
"We are actively pursuing several leads on both sides of the Illinois/Indiana border in the search for suspects and information in the case," Martinez said.