The corpse was found nearly intact, with coroners discovering remnants of food in the stomach during an autopsy at the burial site, said police.

A toxicology test will determine whether or not the death of Shen-Lee Chin-mei was indeed a result of poisoning, explained officers.

Shen-Lee's daughter-in-law, surnamed Wen, recently admitted to poisoning her mother-in-law, who had often coerced her into working the fields, noted media.

Wen made the confession after she was arrested for allegedly drugging her husband twice earlier this year, police said.

The husband recalled his mother prior to her death exhibiting symptoms such as frothing at the mouth and blue discoloration of the skin and believed she had been poisoned.

During a search of their home, police discovered Carbofuran —the poison believed to have been used to drug the husband —stashed in Wen's closet.

According to reports, Wen, who is originally from China, had been unhappy with her marriage of 12 years and often got into heated arguments and scuffles with her husband.