Antinette Keller Update: Suspect pleads not guilty in Northern Illinois student's death

(CBS/AP) SYCAMORE, Ill. - A 34-year-old Illinois man has pleaded not guilty to murder charges in connection to the October slaying of Northern Illinois University art student Antinette "Toni" Keller.

PICTURES: Antinette Keller Missing

According to the Daily Chronicle, William Curl, of DeKalb, pleaded not guilty to Keller's murder Tuesday. He was arraigned on five counts of first-degree murder, one count of concealing a homicidal death, one count of arson and one count of criminal sexual assault.

A grand jury indicted Curl last month and prosecutors have 120 days to decide whether they will seek the death penalty.

Keller, 18, reportedly told friends she was going to work on an art project in popular Prairie Park, just west of Chicago, when she was last seen Oct. 14. Her remains were found two days later, but it wasn't until Jan. 6 that investigators confirmed that the body was in fact Keller's because it was so severely burned.

Police said they interviewed Curl because he was known to frequent the park. Investigators said Keller's death appeared to have been a crime of opportunity and that Curl did not know the freshman student.

Curl is being held in the DeKalb County Jail on $5 million bond.

COMPLETE COVERAGE OF THE ANTINETTE "TONI" KELLER CASE ON CRIMESIDER