By Jonathan Kent
BBC News, Kuala Lumpur
A Malaysian princess has been murdered while trying to defend her husband from the couple's 21-year-old son.
Police say the youth, who is the nephew of the sultan of the Malaysian state of Pahang, died later in hospital apparently from a drug overdose.
Sixty-four year old Princess Kamaria Sultan Abu Bakar, who was the Sultan of Pahang's half-sister, was killed at her family home in the city of Kuantan.
Her husband, Prince Ismal Sulaiman, was seriously injured in the attack.
He is a member of another of Malaysia's nine royal houses.
Police arrested the youngest of the couple's eight children, Shahzan, at the scene - he died some six hours later.
Eyewitnesses say he appeared to be heavily under the influence of drugs. Police say they recovered a combat knife and a screwdriver from the scene.
The princess is due to be buried before sunset prayers on Tuesday.
Malaysian royalty seem to have suffered more than their fair share of tragedy and scandal in recent years.
In 2002, the young second wife of a prince from the state of Perak's royal family was murdered.
The prince's first wife was arrested but released without charge during the investigation. Four men, including two black magicians, were eventually convicted of her murder.