A 52-year-old man has been charged with the murder of John Murray Morton whose body was found in the back of a boat in Nelson two weeks ago.
His body was found in a white boat at Nelson Haven on QE2 Drive on August 4.
Police earlier said he had been subjected to a serious assault, and he was not the owner of the boat that he was found on.
Police said the man charged with his murder was a local man and was known to Morton.
Detective Inspector Paul Borrell said a team of detectives, analysts, forensic scientists and fingerprint experts, had worked tirelessly on the investigation.
"I would especially like to pass on our thanks and appreciation to members of the Nelson community and media for their support to date with this investigation," Borrell said.
"As result of this support, valuable information critical to our enquiry has been received which included information provided anonymously to police.
"Thorough investigation, attention to detail along with the use of a variety of investigative techniques have brought us to this important milestone in this investigation.
"We are and remain absolutely committed to keeping our communities safe and will make every effort to bring persons who choose to commit such serious crimes against others to account."
Detectives were brought in from Christchurch, Dunedin and Invercargill.
Anyone who may have provided earlier information about the accused man now in custody, or has further information relating to the death of Morton, is asked to contact the Nelson Police on 03 546 3895.