A Kampong Speu man has been arrested for the brutal murder of his grandmother after an argument over a coconut.

The murder took place on Monday at 3.30pm in Prey Ch village, Prey Nhet commune, Kong Pisey district.

The suspect, Chey Hunam, took a machete and stabbed his grandmother, Bot Roeun.

The first blow hit her neck from behind, and the second blow cut her mouth, causing her death instantly at the scene.

After receiving information, Prey Nhat police immediately arrested the suspect and brought him for questioning.

The suspect told the police that the reason he killed his grandmother was that he was angry at her for preparing a coconut for another grandchild before him.

Authorities said the suspect was a drug user.

The suspect remains in custody pending legal procedures.