Police have named the seven people who lost their lives in the tragic crash in Waverley, south Taranaki on Wednesday morning.
Two cars collided head-on on State Highway 3 north of Waverley at 11:11am.
Four people died on impact, two died at the scene and one person died in hospital on Thursday morning.
In the car travelling north were 76-year-old Rosalie Porteous, 80-year-old Ian Porteous, 84-year-old Ora Keene and 79-year-old Brenda Williams from Waverley.
In the other car were 28-year-old Jeremy Thompson, eight-week-old Shady Thompson and eight-year-old Nivek Madams from Whanganui. They were southbound.
The sole survivor of the crash, understood to be Ani Madams, is in Wellington Hospital in a critical condition.
She was the front-seat passenger of the southbound car.