Police investigating the death of Nelson man, John Murray Morton, say they're still building a picture of the hours leading up to his death.
Mr Morton's body was discovered in the boat he lived on, on Thursday morning.
A post mortem was completed yesterday and Nelson police said the number and nature of his injuries suggest he was the victim of a very violent attack.
Investigating officer Detective Senior Sergeant Craig Johnston said police were looking at Mr Morton's associates for clues.
"We're just working our way through, we're identifying a number of persons of interest to us, and people known to associate or have been with Mr Morton in recent times."
Mr Johnston said police would be approaching those people and seeking information from them.