In a statement provided to media by police, Humphreys' sister Taresa said the loss of her brother continues to have a major impact on the family's lives.
"The news that someone has been arrested for his murder is encouraging and we hope that justice will be served for Adrian's sake and, for the safety of other good New Zealanders, we sincerely hope Adrian has not died in vain."
It had been 97 days since Humphreys' death and the investigation team was relieved that they could begin the process of holding someone to account, detective senior sergeant Gerard Bouterey said.
"We have been in contact with Adrian's family in the United Kingdom and advised them of this significant development.
"I would like to use this opportunity to thank the residents of Tāngarākau for their support during a very unsettling period for this close-knit community.
"I would also like to acknowledge the investigation team and specialist support staff who have worked very long hours piecing together the events that led to Adrian's death."
The investigation remains active and ongoing.
"While a charge of murder has been filed, we do believe there are still people with information about Adrian's death who need to do the right thing and come forward and speak with us," Bouterey said.
Anyone with information is asked to contact Police via the dedicated phone number for this case, 0800 287 453.
