AN Oxford University worker wanted after the murder of a hairdresser has been arrested.
Guglielmi said the victim was involved in a relationship with Lathem, but that they had "some type of falling out".
Chicago Police Department chief spokesman Anthony Guglielmi said: "We do have an idea of their whereabouts".
"We are also thankful both men are safely in custody and this did not end in further tragedy".
The body of Trenton Cornell-Duranleau, a hair stylist, was found in Lathem's Chicago apartment on 27 July.
Authorities haven't detailed the relationship between 42-year-old Lathem and Cornell-Duranleau, who moved to Chicago from the Grand Rapids, Michigan, area after receiving his cosmetology license.
Professor Wyndham Lathem surrendered at a federal courthouse in Oakland at about 7:30 p.m Pacific Time and the University of Oxford employee Andrew Warren turned himself in to the San Francisco Police Department at around 6:30 p.m.
Both men are scheduled to appear in court in California, where authorities will seek to have them transferred to Chicago. The other suspect, Andrew Warren, a treasury assistant at one of Oxford's residential colleges in England, was being held at the county jail in San Francisco. The men are awaiting extradition to IL on first-degree murder charges, CNN reports.
Chicago police said Warren was 56; he was booked into jail as age 49.
On the same day he was killed, but before his body was discovered, Lathem and Warren drove about 80 miles to Lake Geneva, Wis., Chicago Police tell The Associated Press.
Late last night, officers said that they had an "idea" where Mr Warren and Mr Lathem are hiding and believe they are "armed and dangerous".
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.
Thames Valley Police spokeswoman Hannah Jones also confirmed that Mr Warren was reported missing on July 25 and investigations found he had left the United Kingdom on July 24, just three days before the alleged murder. Police said Warren has no apparent connections to Northwestern, and it's unclear why he was in Chicago.
"There is no indication of any risk to the Northwestern community from this individual at this time". Lathem's passport and Warren's travel visa were restricted.