A 34-year-old DeKalb man has been charged with first-degree murder, criminal sexual assault and arson in the death of Northern Illinois University freshman Antinette "Toni" Keller, DeKalb County authorities said Friday.

William P. Curl, of the 500 block of East Taylor Street in Chicago, allegedly "caused the death of the victim during the course of committing a criminal sexual assault and during the course of an arson," said State's Attorney John Farrell at a news conference Friday night.

Authorities would not get more specific than that about how Keller died.