A 28-year-old man has been charged with assault with intent to injure and injuring with intent to cause grievous bodily harm in relation to the death of 30-year-old Jasmine Wilson.
He is due to appear in Whanganui District Court tomorrow.
It is the third arrest police have made as they continue to investigate Wilson's death.
She died in Wellington Hospital on August 2, two days after she was taken to Whanganui Hospital in a critical condition with non-accidental injuries.
Police have also arrested a 28-year-old woman and a 48-year-old man on a charge of perverting the course of justice.