Police are investigating the death of a 26-year-old woman whose body was found at her home in Tseung Kwan O this afternoon.

The dead woman's older sister had been unable to contact her for two days, and went to Choi Fu House in Choi Ming Court at about 4pm to look for her sister.

When no one answered, the woman called a locksmith to open the door.

She found her sister and her sister's 28-year-old boyfriend lying unconscious inside a bedroom near a container of charcoal. She then called the Police.

The sister was declared dead at the scene while the man was sent to Tseung Kwan O Hospital.

A post-mortem will be conducted tomorrow morning.