Investigators are but to search out the physique of the 22-year-old from Essex who was final seen in Auckland on 1 December, however Detective Inspector Scott Beard mentioned proof indicated she had been killed.
Ms Millane’s household have been left “devastated” by the information, he added.
“The proof we’ve got situated thus far, our scene examination, among the CCTV footage we’ve got, and our investigation, has decided that Grace is now not alive and that this can be a homicide investigation,” he mentioned. “Grace’s household have been suggested of this growth and they’re devastated.”
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New Zealand Police mentioned the homicide suspect will stay in custody till Monday morning, when he’ll seem within the Auckland District Courtroom.
Ms Millane was described as a “beautiful, outgoing, fun-loving, family-orientated daughter” by her father, David Millane.
She graduated from the College of Lincoln in September and had launched into a year-long worldwide journey.
After visiting Peru she arrived in New Zealand on November 20 and had been nearly day by day contact together with her household till December 1 – the day earlier than her 22nd birthday.
The final confirmed sighting of Ms Millane was at 9.41pm the identical day on the Citylife Resort in central Auckland, when she was seen with a “male companion”.
Det Insp Beard confirmed that the person taken into custody by police on Saturday was the identical particular person.
Detectives additionally seized a “automobile of curiosity”. Earlier searches of Ms Millane’s lodging at a backpackers’ hostel discovered a number of gadgets, together with her passport, had been lacking.
Police additionally launched photographs of a pink watch and a necklace belonging to her and requested for the general public’s assist in discovering them.
The most important police search and public campaign for information led to dozens of calls being made to a hotline.
“We nonetheless have no idea the place Grace is,” mentioned Det Insp Beard. “I wish to reassure everybody, each right here and overseas, that New Zealand Police are decided to do every thing we will to search out her.”