A 16-year-old youth has been charged with the murder and aggravated robbery of US student Kyle Whorrall at an Auckland bus stop.
Police announced the teen's arrest on Thursday morning.
The teenager appeared before the Youth Court in Auckland on Thursday afternoon.
The youth was charged with robbery and murder with a stabbing or cutting weapon.
A 32-year-old North Shore woman has also been charged with being an accessory after the fact to murder and appeared in the Auckland District Court on Thursday.
Both were remanded in custody and would next appear at the High Court in Auckland on 14 May.
Neither made a plea nor applied for bail.
Whorrall, who was a PhD student, was attacked at a bus stop on St Johns Road in Meadowbank on Saturday night.
Kyle Whorrall, 33, was killed at an Auckland bus stop over Easter weekend. Photo: GO FUND ME / SUPPLIED
He was taken to hospital but later died from his injuries.
Police have described it as "a senseless attack".
Detective Inspector Glenn Baldwin said that on Tuesday afternoon, police obtained further information about a black SUV that they had been looking for.
"I can confirm we have now located this vehicle on the North Shore, and it has been seized by police with a detailed forensic examination underway."
Kyle Whorrall, 33, was killed at a bus stop on St Johns Rd in Meadowbank, Auckland. Photo: SUPPLIED
Police had also executed a search warrant at a Beach Haven address.
Detective Inspector Baldwin said police were aware there were other occupants in the SUV at the time the victim was attacked.
"Our enquiries are ongoing to locate these persons of interest, and I encourage them to do the right thing and come into their nearest police station or phone us."
Officers appreciated the support from the St Johns community, and further afield.
"There has been a stream of information that has come into us, and we are working through this.
"We value and appreciate the community support," Detective Inspector Baldwin said.
Detective Inspector Glenn Baldwin speaks to media about the case on Tuesday. Photo: RNZ / Marika Khabazi
Police were still seeking information on a white Toyota ute, which had been cut off by the SUV.
"I want to reiterate to those occupants that they are witnesses, and their information is important to our investigation," Baldwin said.
"Please come forward at the earliest opportunity."
Anyone with information, can call police on 105 using the reference number 250419/9858.
Information can also be provided anonymously via Crime Stoppers on 0800 555 111.
Vigil held near where Whorrall attacked
Meanwhile, a vigil has been held this morning on St John's Road near the scene of the weekend's fatal attack on Whorrall.
Residents, friends and colleagues attended. They laid flowers and paid tributes to Whorrall.
His flatmates said he was a kind, gentle person and would "unapologetically geek out" on things he was passionate about.
They said he had found family in New Zealand and lots of people cared about him.
Kyle Whorrall's flatmates honour their friend at the vigil. Photo: RNZ / Lucy Xia
Photo: RNZ / Lucy Xia
Former professors in the US have paid tribute to Whorrall, describing him as "soft-spoken, polite, and enthusiastic".
A former tutor of the PhD student said the entomology community in California had been rocked by the news.
Kyle Whorrall's colleague from Manaaki Whenua pays an emotional tribute to him. Photo: RNZ / Lucy Xia
