At least one person was taken into custody in a SWAT investigation in suburban Addison, police said.
Police say the suspect forced his way into the home and killed the man who was dating his ex-wife.
The students were last seen alive on April 16, and a mutual friend reported them missing the following day after being unable to reach them both, authorities said.
Law enforcement authorities in Florida say they have found the body of one of the two missing University of South Florida doctoral students on a bridge over Tampa Bay, and a roommate has been taken into custody.
A man was charged with the murder of his three-week-old son, Jace, the Iroquois County Sheriff's Office said.
A new report shows the growing need for support: Calls to the Illinois Domestic Violence Hotline have surged in the past year.