An Oxford University employee has been denied bail after appearing in court in San Francisco accused of murdering a 26-year-old hair stylist.

A US professor suspected of stabbing a 26-year-old Chicago man to death is due in a California courtroom on Monday.

Two university employees wanted over the stabbing death of a Chicago man have surrendered peacefully in California and will be returned to Chicago for interrogation, authorities said.

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.