He's the Streamwood man accused of killing his sisters inside their home last week.
The victims, 21-year-old Janiya Jenkins and 10-year-old Eyani Jones, were found stabbed to death Wednesday evening in the 1600-block of McKool Avenue in Streamwood, police said.
The suspect, Jalonie Jenkins, was taken into custody at a Metra station in Downers Grove Sunday night after a days-long manhunt that included Bensenville, police said.
Friends of the victims told ABC7 Jalonie Jenkins is the older brother of the two victims.
Jenkins is facing two charges of first-degree murder, Streamwood police said.
Friday in court, Jalonie Jenkins' attorney said he suffered a mental health crisis and the crime was a result of that.
A judge ordered Jenkins to be detained, denying him pretrial release.
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Jenkins' lawyer requested that his client undergo a mental health evaluation.
The suspect is due back in court June 26.