The DNA profile of an unknown woman has been indicted in the death of an infant found inside a backpack in Illinois three years ago, prosecutors said.

A grand jury on Thursday indicted the unknown female DNA profile on a felony charge of failure to report the death or disappearance of a child in connection to an infant known as “Baby Hope,” a full-term newborn girl who was found dead by landscapers in Wheaton in August 2016.

“The investigation into what happened to Baby Hope will not end until we have answers to all of our questions,” DuPage County State’s Attorney Robert Berlin said in a statement on Monday. “For nearly three years, the DuPage County Sheriff’s Office has dedicated significant resources to not only identify Baby Hope, but to also learn what happened to her.”

A coroner has previously confirmed that the newborn took at least one breath before she died. She was buried a month after the gruesome discovery while surrounded by emotional police officers and strangers alike, the Daily Herald reports.

The following spring, a tree and plaque were dedicated in the girl’s honor in the Chicago suburb. It included a reminder that hospitals, fire stations and police departments are designated safe havens in the state, where infants can be dropped off without repercussions.

“May perpetual light shine on her,” the memorial reads. “Don’t panic! Call 1-888-510-BABY. No shame. No blame. No names.”

The indictment stems, in part, from the three-year statute of limitations in the case, Berlin told the Chicago Tribune.

The person charged has been identified as Jane Doe, although her identity remains unclear. The indictment listed her as a parent, legal guardian or caretaker for the newborn.

In May 2018, authorities released images of what the newborn’s parents might look like. They said the girl’s DNA shows her parents were Hispanic and that her mother was taking medication for epilepsy or bipolar disorder, the newspaper reports.