An Oxford University employee has been arrested alongside a US professor following a nationwide manhunt for the murder suspects, police have said.
Somerville College senior treasury assistant Andrew Warren, 56, and Professor Wyndham Lathem, 42, were arrested in Oakland, California, more than 2,000 miles from the crime scene, a spokesman announced on Friday.
They have been accused of fatally stabbing Trenton Cornell-Duranleau, 26, in Lathem's apartment in Chicago on July 27.
Chicago Police spokesman Anthony Guglielmi announced the development on Twitter, writing: "CPD has gotten word that Prof. Wyndham Lathem and Andrew Warren are both in police custody in Oakland, CA."
Oxford University had urged Warren to hand himself in and a spokesman said his colleagues were "shocked" to have heard of the case.
Warren, who says on Facebook he lives in Swindon, Wiltshire, and Lathem, a microbiology professor at Northwestern University, are accused of repeatedly stabbing the victim in the 10th floor apartment before fleeing.
Detectives said they believed they knew their whereabouts but wanted to end the situation calmly without another "tragedy".
Mr Cornell-Duranleau is a hairstylist originally from Corunna, Michigan, but was living in Chicago at the time of his death.