According to Kampuchea Thmey

Elderly American man dies in a guesthouse from an heart attack.

Phnom Penh
An elderly American man was found dead at 0.30AM past midnight on January 25 2016 in the guesthouse Loon Star Loun (ឡូ​ន ស្តា​រលូន) located Number 30, Street 23, Phum 8, Sangkat Chey Chumneas (ជ័យ​ជំ​នេះ​), Khan Daun Penh (ដូនពេញ).

Authorities identified him as Cedward Breueallan, male, 73 years old, tourist, passport number XXXXXXXXXX, staying in the guesthouse where he was found dead.

His wife was identified as Limin, 42 years old. She told the authorities that they were married in 2005 in China. After they were married her husband had already physical problems (hearth disease) for which he was taking medicines.

She added that she always came as a tourist to Cambodia and on December 12 2015 she and her husband visited the country once more. They stayed in the guesthouse (where the incident happened) from their arrival (in the country) till the moment of the incident.
Suddenly her husband told her that he didn’t feel well. He suffered heartburn and pain under his bellybutton. The wife left to buy medicines for her husband but (after taking the medicines) the condition of the victim didn’t improve so she also called some friends of her husband but they were not reachable (?) (លើ)
Than she informed the owner of the guesthouse to come help with with CPR and call an ambulance from Calmette Hospital to bring him to the hospital but when the doctor arrived he told (her) that the victim already died.

A biopsy (executed by the Municipal Court of Phnom Penh) showed that the victim died of an heart attack.
Currently the body is at Stung Meanchey pagoda.

Read more here.