The incident took place on November 2nd at about 10.30am at Munumb Village, Banz in Jiwaka Province.
According to police reports, the deceased, going by the name of Tonny Dua, was seriously wounded by his wife with a bush knife.
The victim was rushed to the Kudjip Nazarene Hospital but died later.
The suspect was apprehended and detained the same day.
Police say she will be arrested and charged formally.
Investigations are still ongoing.