The men were involved in a two-vehicle crash on State Highway 1 south of the Waimakiriri River bridge on Saturday.
Yesterday, police said Jarrad Ethan Blackler, 23, had died in Dunedin Hospital after suffering critical injuries in a crash on a rural South Canterbury road early on Sunday morning, bringing the road toll from the weekend to 11.
Wanganui residents Zane Town, 14, and his mother Jennifer Town, 41, and Palmerston North woman Judy Daryl Redfearn, 68, died in a head-on collision near Marton on Saturday.
A collision in the Bay of Plenty on Saturday night claimed the lives of three women from the same family.
Tevunga Vaea, 71, her daughter Louina Vaea, 45, and daughter-in-law Takua Vaea, 32, died when the minivan they were in and a car crashed.
Warkworth motorcyclist Karl McCallion, 46, died in the crash on State Highway 1 near the Satellite Station Rd intersection about 9.15pm on Saturday.
Police have called the weekend road toll a "preventable tragedy".