Family and friends of Gena Chiodo had gathered to look for the missing Calumet City woman, but then police asked them not to.
Police investigators said they are ruling nothing out as they continue to follow leads in Chiodo's disappearance.
They do confirm that they have questioned a person of interest, but they will not say who that person is, or if that person is in custody.
The request came Saturday morning just before authorities and volunteers were scheduled to gather to search at separate locations focusing on a forest preserve a few blocks from Chiodo's Calumet City home.
Calumet City Police Chief Edward Gilmore told the concerned who gathered for an afternoon update that "a person of interest" provided them with new information about the disappearance that changed the focus of their investigation.
Investigators say it's possible "foul play may be involved" in the disappearance of Chiodo who's been missing since last weekend.
Her vehicle and house keys were left at her home.
Friends say disappearing for nearly a week is unusual for Chiodo.
The 42-year-old was last seen October 13 at the south suburban home she shared with her boyfriend of one year.
He's been questioned by police.
Chiodo's father said before she went mussing, Chiodo was planning a November visit to Florida for her mother's 68th birthday.
Meanwhile Saturday night those who know and love Chiodo are holding out hope.