Arin M. Fox, 42, of Algonquin.

A woman faces up to 60 years in prison after she pleaded guilty but mentally ill to stabbing an elderly couple to death inside their house in Algonquin.

Arin M. Fox, 42, of Algonquin, was charged in November 2020 with four counts of first-degree murder, aggravated battery to a victim older than 60, domestic battery and two counts of unlawful possession of a stolen vehicle.

Fox was arrested in Douglas County, Colorado that same month after police said she fled from Illinois following the murders of Leonard J. Gilard, Jr, 73, and Noreen S. Gilard, 69, both residents of Algonquin.

The Algonquin Police Department was called around 6:40 p.m. on November 8, 2020, to the 600 block of Red Coach Lane in Algonquin for a well-being check.

Officers made entry to the residence and found Leonard J. Gilard and Noreen S. Gilard deceased.

Algonquin Deputy Police Chief Ryan Markham said at the time that the victims’ wounds were consistent with that of a stabbing. No firearm was used in the crime.

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Markham said that the incident was believed to be domestic violence-related.

Prosecutors said the couple was killed sometime between November 6 and November 7, 2020.

Fox, who resided in the same home as the victims, fled to Colorado in the couple’s car after their murders.

Prosecutors said she checked herself into a psychiatric facility during the evening hours of November 7, 2020. Fox was later taken into custody.

Fox made statements to others admitting that she harmed the victims, prosecutors said.

Following her arrest, a competency evaluation was completed by two doctors.

The two forensic psychology experts said that Fox’s mental health symptoms were “so severe that they are interfering with her adjudicative competence and her ability to communicate in a rational manner.”

Fox has a “long history” of mental illness and medication non-compliance, and has been diagnosed with schizophrenia and bipolar disorder, court documents show.

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One of the experts estimated Fox could be restored to fitness within 60 days of inpatient psychiatric medication and psycho-educational services.

A judge in October 2021 agreed with the doctors’ findings and ruled Fox unfit to stand trial.

The woman was transported to the custody of the Illinois Department of Human Services and treated at a secure inpatient facility. Fox’s fitness was deemed restored in June 2022.

Last week, Fox entered into a plea of guilty but mentally ill to first-degree murder during a hearing in front of McHenry County Judge James Cowlin, court records show.

A contested sentencing hearing is scheduled for December 6. Fox will face an agreed range of 40 to 60 years in the Illinois Department of Corrections.

Her sentence will be served at 100% of the time imposed.