Rurik Jutting, the British investment banker on trial for murdering two Indonesian women in Hong Kong, was a narcissistic sadist trying to mask the "fragile" shell of his personality having suffered sexual abuse at a boarding school, a court heard Monday.

Opening Jutting's defense as the trial entered its second week, lawyer Tim Owen called on Dr. Richard Latham, a British consulting forensic psychiatrist who has worked on between 50 and 75 similar cases.

Latham told the Hong Kong court that Jutting suffered from recognized disorders from cocaine and alcohol abuse on top of his other personality disorders of sexual sadism and narcissism.