Police today formally identified the body as Ruarangi.
A trained lifesaver, McKinnon thought nothing of plunging into the sea to try to reach the body that was being swept further out by swift currents.
"By then he was 80-100m out and getting too far out."
But McKinnon knew it was important for grieving whanau see their loved one again and continued until he caught up with the victim.
As he swam back to shore with the body his workmates called emergency services.
Soon after, members of the extended Ruarangi family contacted him on Facebook and thanked him for his actions.
Mimou Charlie wrote on a public post: "From my Family and myself I would like to say A Huge Aroha and Thank you from the bottom of our hearts ! <3 it has been a stressfull and long week for my family, because of you we are now at Peace ! :( May God bless you and your Family xo Thank you."
McKinnon said they had also asked to get together.
"They just can't thank us enough," said McKinnon.
"They want to meet up."
He told the Herald he was simply doing the right thing.
"I'm not a hero. I'm just glad he's home and their minds have been put at ease."
Meanwhile, the Cook Island community is preparing to bury Ruarangi next week with a family and burial service two days apart.
Many heartbroken by the tragedy have posted about the tragedy claiming the life of a man with an "open arm to each and everyone around him".
He was also recognised as a kind and generous person who would be greatly missed.