A second Briton has been remanded in custody in connection with the killing of two young girls in southern Spain.
The judge jailed Robert Graham, 39, who was arrested Saturday, on suspicion that he was an accomplice to Tony King.
King has confessed to killing 17-year-old Sonia Carabantes in August and 19-year-old Rocio Wanninkhof in 1999.
Spanish National Radio said the judge had concluded that Graham at least knew what King had done.
King was arrested last Thursday in southern Spain.
The men are in prison at Alhaurin de la Torre, close to the towns where both girls were from.
The men reportedly met each other in jail in Britain several years ago but police have declined to confirm this.
Bar worker King has also admitted to at least three other sex crimes in southern Spain in recent years. He has been placed in an isolation cell to protect him from other inmates, police said.
British newspapers have reported that the powerfully built Briton is actually Tony Bromwich, known as the Holloway Strangler, who served five years of a 10-year sentence for a string of sex attacks in north London in the mid-1980s.
King admitted to the two murders in Spain after DNA samples taken from his home matched DNA recovered in the two cases.
He was detained after his girlfriend informed police that he had returned home on the morning of Carabantes' disappearance with blood on his clothes and scratches on his face.