University professor arrested in Chicago murder

Wyndham Lathem, 42, of Northwestern University in Chicago and Andrew Warren, 56, of Oxford University in England, were in police custody in Oakland, California, according to a tweet from a Chicago police spokesman.

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.

Trenton Cornell-Duranleau, a 26-year-old hairstylist, was found dead in a Chicago apartment last week with multiple stab wounds.

Authorities revealed Friday that Lathem had sent a video message to friends and family members apologizing for the crime.

Officials have not disclosed the connection between the two suspects or their relationship with the victim. 

Lathem is a medical researcher and associate professor at Northwestern University's downtown Chicago campus. He has been employed by the university for 10 years. 

Northwestern said in a statement that Lathem was "placed on administrative leave and banned from entering the Northwestern University campuses."

On a university web page that has since been deleted, Warren was listed as a senior treasury assistant at Oxford's Somerville College. 

Among the unanswered questions was why Warren suddenly left Britain for his first trip to Chicago on July 24, according to the Chicago Tribune newspaper. 

Another mystery is a $1,000 donation to a library in the neighboring state of Wisconsin made after the attack in the victim's name, according to the newspaper.