Detective Senior Sergeant Peter Middlemiss said the 43-year-old has since died.
“Police remain focused on determining what occurred prior to Sean’s death and understanding the cause of his injuries.
“We know that Sean was at the address as a guest and was known to the occupants.”
No charges had been laid yet, Middlemiss said.
“Police extend our deepest condolences to his family who we will continue to keep updated as the investigation progresses.”
Middlemiss said it was an isolated incident with no risk to the public.
“We’d like to hear from anyone who has information that could assist with this investigation.”
Anyone with information that could help police can contact 105 and reference the file number 241201/7304 Operation Croydon.
People can report information anonymously via Crimestoppers on 0800 555 111.
Georgina Campbell is a Wellington-based reporter who has a particular interest in local government, transport and seismic issues. She joined the Herald in 2019 after working as a broadcast journalist.