A motorist, 27, involved in the crash was originally charged with serious driving offences. An additional charge of manslaughter had now been laid, police said today.
The man is due back in Manukau District Court next month.
It was earlier said that Hu was wearing his seatbelt but had received quite a "strong impact" in the crash.
Police cut the seat belt and they managed to pull the unconscious Hu out of the car and performed CPR for several minutes, but could not revive him.
"It is such a tragedy. This man was out enjoying the day, doing nothing wrong, waiting at the lights and then this happened, just gone, it could be any one of us. It has damaged a family's life too," ex-St John first responder Dr Jacky Lam said at the time.
Hu's family was due to move into a new home in the Howick area in the coming weeks to have access to better schools for his daughters.
Colleagues and friends of the victim described him as a devoted father and family man.
Hu was also a former sport teacher at Shanghai Jincai High School.
A Givealittle page set up to help Hu's wife and children reached just over $169,000.
More soon