Warren and the other suspect, former Northwestern University microbiologist Wyndham Lathem, surrendered in the San Francisco area last week after being on the run for eight days.
Authorities have said the attack on Cornell-Duranleau, a MI native who moved to Chicago past year, was so brutal that the blade of the knife investigators believe was used in the stabbing was broken.
Both men face first-degree murder charges in Chicago.
An Oxford University employee will be returned to Chicago for questioning alongside a USA professor on suspicion of murdering a 26-year-old hair stylist found with more than 40 stab wounds.
The weeklong search for Andrew Warren and Northwestern University professor Wyndham Lathem drew global headlines. Warren arrived in Chicago a few days before the killing, his first visit to the USA, according to reports.
Wearing an orange sweatsuit in his first court appearance, Warren waived extradition, meaning he will not contest being transferred to an IL jail.
Authorities say an Oxford University financial officer accused in the fatal stabbing of a Chicago man is scheduled to make an initial court appearance Friday.
Warren - a senior treasury assistant at Somerville College, a part of the University of Oxford in Great Britain - surrendered to police in San Francisco last week. Authorities haven't revealed any motive in the killing.
He appeared in court earlier this week and will be returned to Chicago for questioning.
Appearing unshaven and sitting at a table with a public defender, Andrew Warren acknowledged he is one of two suspects wanted in arrest warrants for the murder of 26-year-old Trenton Cornell-Devanleau on July 27.
Chicago police say a hair stylist slain last month was stabbed more than 40 times with "lacerations and mutilations" to his upper body.
Chicago police spokesman Anthony Guglielmi (goo-lee-EHL'-mee) said Friday that the attack on Cornell-Duranleau "certainly was very intense".
Earlier this month, Mr Warren handed himself in San Francisco, almost 2,000 miles from Chicago, while Prof Lathem gave himself up in Oakland, also in California, on 4 August.
The AP also reports the attack on Cornell-Duranleau was so brutal that the blade of the knife that investigators believe was used in the stabbing was broken. With the assistance of a court hearing aid, he answered "yes" to a series of questions from Judge Edward Torpoco, who asked if Warren understood his rights. Lathem has waived extradition to Chicago.