A 22-year-old murder suspect was held as he tried to leave the country and his wife was found stabbed to death.
Police forced their way into a house in Eastdown Park in Lewisham, south east London, at 5.50pm yesterday and found the 21-year-old victim, who was pronounced dead at the scene.
Her family have been told but she has yet to be formally identified, Scotland Yard said.
Her husband was arrested today near Folkestone in Kent and will be brought back to south east London for questioning.
A post-mortem examination will take place in due course.
Anyone with information can call police on 020 8721 4805 or Crimestoppers anonymously on 0800 555 111.