Michael McKee, a 39-year-old Lincoln Park resident, is being held at the James A. Karnes Corrections Center in Franklin County, Ohio.
McKee allegedly killed his ex-wife, Monique Tepe, and her dentist husband, Spencer Tepe, in Columbus over the holidays.
The couple was found shot to death in their home on Dec. 30. Their two children were found safe inside the home.
Court documents show that McKee was identified using surveillance footage from the neighborhood.
The murders led investigators across several states and made national headlines, but authorities ultimately tracked McKee down and arrested him in Rockford on Saturday. It's unclear what McKee, who works as a vascular surgeon, was doing there.
A grand jury in Franklin County returned an indictment against McKee on Friday. At the time, he was being held in a Winnebago County jail.
McKee is charged with two counts of Aggravated Murder and one count of Aggravated Burglary.
All counts include a three-year firearm specification for using a gun to commit Aggravated Murder and a six-year firearm specification for using a firearm suppressor.
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According to court records, McKee and Monique Tepe divorced in 2017. A motive for the killings is not yet known.
You can contact the Illinois domestic violence hotline at 1-877-863-6338 click here for more information.