The DuPage County sheriff's office will announce "new developments" this week in the investigation into the 1985 rape and murder of a 15-year-old girl near Glen Ellyn, officials said Monday.
Authorities said details would be released at a news conference Thursday marking the 26th anniversary of Kristina "Kristy" Wesselman's death.
Kristy was raped and repeatedly stabbed July 21, 1985, as she walked home through unincorporated DuPage after buying a candy bar and soda from a nearby grocery store, police said.
Although authorities have pursued a variety of leads and investigative techniques over the years, the slaying more than two decades ago remains one of the area's most high-profile cold cases.
Sheriff's spokeswoman Dawn Domrose declined to elaborate on the new developments Monday, saying police are keeping the information "close to the chest."
State's Attorney Robert Berlin said no one has been charged with the murder. He declined to comment further.
Wesselman's mother Sandy is expected to speak to the media at the news conference, officials said. Further details weren't immediately available.