A man interviewed over an alleged fatal hit-run on the water in Victoria's Port Phillip Bay has been released pending further inquiries.
The 41-year-old Carrum Downs man was arrested on Monday after he contacted police following a plea for the skipper to come forward.
A 29-year-old Blackburn man, from South Korea, was skin diving with a mate on Sunday when he was struck and killed about 1pm, in what the coast guard described as a "hit-and-run on the water".
The pair had been spearfishing several hundred metres offshore from Canadian Bay when the tragedy happened.
Water police Senior Sergeant Alistair Nisbet described both men as experienced divers who were following the rules.
"They were using buoys and floats and flags, everything that's required to obviously display that they are swimming out in the water," he said.
It was possible the skipper did not know he had struck a person, but likely he was aware he had struck something.
The accident happened offshore from Point Eliza, in the southern end of Port Phillip Bay.
The Carrum Downs man was arrested in Mordialloc and interviewed over the death. Police said on Tuesday he has been released pending further inquiries.
