According to Kampuchea Thmey (Graphic Warning!)

British national found dead in a rental room; exhaustion/fainting suspected as death cause.

Siem Reap
A British national was found dead in a rental room in Phum Banteay Chas (បន្ទាយ​ចាស់), Sangkat Slok Raam (ស្លក្រាម), Krong Siem Reap.

According to the authorities the victim was a tourist, who hired the room temporary, was found dead in the room located in the above mentioned location.

The incident, which shocked neighbors and the owner of the room, happened at 7PM on January 13 2016. According to the conclusions of the authorities it could be that the victim already died 2 days before his body was found.

Please note that a team of doctors and the authorities who did an authopsy/examination informed that the victim died because of exhaustion/fainting and that drugs were found in the room.

Read more here.