The 37-year-old Vietnamese suspect stabbed his wife at their home in Phnom Penh around 11 p.m. on August 16, then fled with their 6-year-old son, the Khmer Times reported.
The wife was found lying in a pool of blood. She was rushed to a local hospital but died on the way.
The Vietnamese suspect was arrested in Khan Chbar Ampov on Friday. He was then handed over to the Meanchey District police for further investigation.