A US professor and a University of Oxford employee wanted over the fatal stabbing of a Chicago man have been detained in California, police said.
Chicago police spokesman Anthony Guglielmi tweeted that Wyndham Lathem and Andrew Warren were both detained by the US Marshals Service.
A manhunt had been under way since first-degree murder warrants were issued for the two men shortly after the body of Trenton James Cornell-Duranleau was found on July 27 riddled with stab wounds in the 10th floor Chicago apartment where Lathem lived.
Police said earlier on Friday that Lathem had sent a video to friends and relatives apologising for his involvement in a crime that he called the "biggest mistake of my life," raising concern among investigators that he might kill himself.
Warren had arrived in the United States three days before the death of Cornell-Duranleau and was seen in surveillance video leaving the building with Lathem that day.
Lathem, an associate microbiology professor at Northwestern University, surrendered at the federal courthouse in Oakland, according to the Chicago Tribune, which quoted US Marshals Service supervisory inspector Ed Farrell.
Warren, a resident at Somerville College, part of the Oxford University Network, was arrested in San Francisco, Mr Farrell said.
Chicago police said the two would go before an Oakland court and then be returned to Chicago, where they would be interrogated by homicide detectives.
"Both individuals will be held accountable for their actions and we hope today's arrest brings some comfort for the victim's family," a Chicago police statement said.
CPD can confirm that Prof Wyndham Lathem sent an apologetic video message to friends & family for involvement in murder of Trenton Cornell pic.twitter.com/8aOLX9K2kE— Anthony Guglielmi (@AJGuglielmi) August 4, 2017