Ariki Rigby. Photo: Supplied / NZ Police
Detectives are continuing "painstaking work" ahead of the second Christmas Ariki Rigby's whānau will spend without her.
The 18-year-old's body was found in a burnt-out car near Havelock North in September 2022, three days after her family reported her missing.
Her death was initially treated as unexplained but later became the subject of a police homicide investigation.
In a statement, Detective Inspector Dave de Lange said police remain committed to solving her murder and bringing justice to her.
"This is the second Christmas Ariki's whānau have been without her, without knowing who carried out this senseless and cruel act, and why.
"A team of experienced detectives in Hawke's Bay continue the painstaking work to find those answers and bring closure for Ariki's whānau.
"Individuals within the Hawke's Bay community know what happened, or could help our investigation, but they are refusing to interact with police."
De Lange said police were making "slow but steady" progress to break the silence by reinterviewing witnesses, studying evidence and following new leads.
"This is meticulous work and remains incredibly sensitive because of the secrecy from those who refuse to come forward.
"We urge them to think of Ariki's grieving whānau this Christmas and do the right thing and talk to police."
On the one-year anniversary on Rigby's death, her whānau said they still mourned her but wanted to move forward by finding those responsible.
Information relating to the investigation can be given to police by contacting police via 105 or online, quoting file number 220905/1265.
Information can be also provided anonymously by calling Crime Stoppers on 0800 555 111.