The Man who is aged in his 40s, was arrested on the evening of Tuesday, 9 March on suspicion of kidnap. Today, Wednesday, 10 March, he has been further arrested on suspicion of murder and a separate allegation of indecent exposure.
The man is a serving Metropolitan Police officer in the Parliamentary and Diplomatic Protection Command. His primary role was uniformed patrol duties of diplomatic premises.
A woman, who is aged in her 30s, was also arrested on the evening of 9 March on suspicion of assisting an offender. She remains in custody.
Officers are searching locations in London and Kent including a property in Deal and an area of woodland near Ashford.
Following the arrest of the police officer, the Metropolitan Police has made a referral to the Independent Office for Police Conduct.