Police will review the case into the death of Christchurch woman Libby McKay.
Ms McKay, 27, died after allegedly falling from a travelling vehicle in Haswell in 2013.
Her partner Mike Brown was driving and claimed she fell and suffered fatal injuries.
At the time he told police he did not push her, and he later moved to Australia.
Mr Brown failed to return to New Zealand to give evidence in the 2015 inquest into the death, where Coroner David Crerar found her injuries were consistent with falling out of a vehicle.
Earlier this month, Ms McKay's mother Pauline Webby claimed she found new evidence that suggests her daughter did not fall out.
A report by Australian crash experts, shown to TVNZ's Sunday programme, found Ms McKay's injuries were not consistent with Mr Brown's version of events, which prompted Chief Coroner Deborah Marshall to review the inquest.
Now, Nelson MP Nick Smith says he wrote to police asking for the case to be re-opened.
"The Commissioner of Police has responded saying the matter had been referred with urgency to the District Commander. The Canterbury District Manager of Criminal Investigations said he would review the investigation in its entirety."
A chain of correspondence between Mr Smith and the Police Commissioner Mike Bush released on Wednesday, shows Mr Bush has request with urgency with for the case to be re-opened.
"On receipt of this report it is the intention of police to review the investigation in its entirety to determine the appropriate next course of action, which will include, making contact with the family of Ms McKay in person to discuss their expectations," Mr Bush's letter reads.
Police have spoken with Ms Marshall and have requested a copy of the Australian report.
Mr Smith told Newshub he is concerned about the evidence Ms Mckay's partner Mr Brown gave and says that her death is 'suspicious'.
"The story of her partner that the injuries from which she died in falling out of his vehicle in Haswell, it does simply not stack in that there was no evidence at the location, no soft tissue injuries and no abrasions of her clothing.
"It adds suspicion that her partner refused to attend and give evidence at the Coroners hearing. I want those answers and justice for the family. This is a 27-year-old young woman who died in suspicious circumstances," Mr Smith says.
Newshub.
