Deputy Commissioner Mike Clement has announced his retirement after 42 years at NZ police.
Clement, who has been the deputy commissioner for national operations since 2014, said he would retire at the end of June.
He also led the organisation's management of firearms law reform afterthe 15 March terror attack, including the buy-back scheme, and played a key role in the response to the Whakaari / White Island eruption.
In a statement he said he was incredibly proud of police and what the organisation represented.
"In all his roles, integrity has been his hallmark," Coster said.
"I wish Mike all the best for a well-earned and happy retirement with his family, who have had to share him with us for so long."
Clement has worked in the undercover programme and on high-profile investigations including that examining historical sexual allegations against former and serving police officers.
He also served overseas, including on a United Nations mission to Jamaica, a homicide investigation in the Solomon Islands and capacity-building in the Pacific.