An Oxford University employee who spent more than a week as a fugitive has appeared in court in the United States accused of murdering a hairdresser whose body was found with more than 40 stab wounds.
Police identified Lathem and Warren as the alleged killers days after Cornell-Duranleau's body was found, and issued first-degree murder warrants for their arrests.
Andrew Warren, who worked as a senior treasury assistant at Somerville College, appeared before a judge in San Francisco where he confirmed his identity.
Warren, a resident of Faringdon, Oxfordshire, has been suspended from his payroll job at Somerville College, part of the Oxford University system.
Warren surrendered peacefully in San Francisco last week after being on the run for eight days with Wyndham Lathem, a former Northwestern University microbiologist. Lathem, 42, surrendered to federal authorities in Oakland.
Warren declined to fight his extradition to Chicago to face the murder charge and said he would accept a public lawyer on the basis that he could not afford his own.
Northwestern has fired Lathem from his post as an associate professor of microbiology and immunology.
On Thursday KPIX 5's Juliette Goodrich spoke face-to-face with Lathem, who appeared calm. His attorney said he likely would be moved in a week or two.
Trump's actions trigger health premium hikes for 2018
The GOP-controlled Senate failed to pass a health bill before it left for a summer break last week. Interviews were conducted in English and Spanish by landline (428) and cell phone (783).
The case has involved peculiar twists, including a cash donation in the victim's name at a Wisconsin library and a videotaped confession sent to friends.
LATHEM: I'm sorry I can't talk unless my attorney says I can.
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.
"We have information to suggest there was tension in the relationship between Dr Lathem and the victim".
He was found on July 27 in Lathem's Chicago apartment along with a knife with a broken blade, and had been stabbed more than 40 times in his upper body, said Anthony Guglielmi, a Chicago police spokesman.
After the hearing, Warren's lawyer, Ariel Boyce-Smith, said: "Mr Warren is agreeable to being transported to Chicago".
During the pair's time as fugitives, friends of Warren encouraged him to hand himself in and said he had not told anyone of his plans to visit the US.