A woman who was shot in the head on a property near Deniliquin in the state's south on the weekend has died in hospital, prompting police to charge her husband with manslaughter.

The 31-year-old woman was on a property in Pretty Pine with five other people when she sustained a gunshot wound to her head – in what police are treating as a possible accident – just after midnight on Saturday.

The woman was taken to Deniliquin Hospital before being airlifted in a critical condition to Royal Melbourne Hospital.

No one else was injured.

Her husband, 32, was arrested by police and taken to Deniliquin Police Station.