Former U.S. Olympian: Home, Walking ... Less Than 3 Months After Near-Death Injury

2x U.S. Olympic star Jamie Nieto is home from the hospital and walking with some assistance less than 3 months after a NEAR-DEATH injury ... TMZ Sports has learned.

As we previously reported, Nieto landed on his head during a training session on April 23rd ... and suffered MAJOR DAMAGE to his back. He lost feeling in his arms and legs ... and was unable to move.

But only 2 1/2 months after the injury, Nieto's manager, Paul Doyle, says his client has miraculously recovered ... so much that he's been sent home from the hospital ... and is WALKING with a walker.

How'd he bounce back? Intense rehab, Doyle says. "He's been treating recovery like a true Olympian."

Probably never be the same though, right? Wrong. Doyle says Nieto expects he'll be on his feet, walking by himself in no time.