PHOENIX - The most-decorated Olympian is back home in the Valley after finishing his storied Olympic career in Rio.

Michael Phelps arrived in Phoenix Wednesday morning with his fiancé Nicole Johnson and baby son, Boomer. The trip home from the Olympic Games could be his last as a competing athlete.

Phelps has assured people that 2016 Olympics are his last. But others, including his longtime friendly rival Ryan Lochte, aren't so sure about that.

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Phelps finished in Rio with five gold medals and one silver in the 100-meter butterfly -- bringing his career Olympic total to 28, 23 of which are gold.

And what's next for the greatest Olympian of all time?

He'll start a stint as a volunteer assistant coach at Arizona State University.