AN Oxford University worker wanted after the murder of a hairdresser has been arrested.
A deputy USA marshal said Lathem's surrender came after fast-paced negotiations through an attorney that led to the fugitive turning himself in at the federal courthouse in Oakland.
Warren, who is British, is in charge of pensions and payroll at the University of Oxford's Somerville College, though his name and photograph have been removed from the school's online directory.
The suspects in the death of Trenton Cornell-Duranleau are now awaiting extradition to IL.
The pair had been named as suspects in the attack that was so brutal the blade of the knife used in the murder had broken off, police said.
Around 10 p.m. Friday evening, Chicago police spokesman Anthony Guglielmi tweeted that Chicago police "has gotten word that Prof".
Warren, a Somerville College resident at Oxford University, was taken to the San Francisco County Jail.
Prof Lathem is a medical researcher and associate professor at Northwestern University's downtown Chicago campus.
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They have been accused of fatally stabbing Trenton Cornell-Duranleau, 26, in Lathem's apartment in Chicago on July 27.
"We do have an idea of their whereabouts and efforts to locate them are only intensifying from here on in", police said in an email to CNN.
"We are also thankful both men are safely in custody and this did not end in further tragedy".
The two were expected to appear in court and eventually be returned to Chicago.
According to police, Lathem sent a video message to various friends and family members apologizing for his alleged involvement in the killing.
According to Chicago police, Lathem, a microbiology professor at Northwestern University in Chicago, knew the victim, although police did not specify the nature of their relationship.
While there, one of them made a $1,000 (£766) cash donation to the public library there in Cornell-Duranleau's name. Lathem and Warren had left the scene about 15 hours earlier, authorities said. To prevent them from leaving the United States, authorities have flagged the passports of Lathem and Warren.
In a freakish twist, police said that on that same day, before the body had been discovered, Lathem and Warren drove about 80 miles (128 kilometers) northwest to Lake Geneva, Wisconsin, where one of them made a $1,000 cash donation to the public library there in Cornell-Duranleau's name.