A 48-year-old man has been arrested following the death of Hamilton man Tama Hurinui Retimana.
Mr Retimana was found wearing only black boxer shorts and socks by a paddling kayaker on December 27.
The 29-year-old was known to be homeless and lived along the banks of the river where his body was discovered, police say.
The accused will appear in Hamilton District Court on Thursday charged with manslaughter.
Police say they are unable to comment further at this stage.