Transcript for Mystery Surrounds USC Football Player's Dramatic Pool Rescue
Okay, Ryan. We'll turn to an investigation this morning about usc football star josh Shaw. Leaping from a balcony to save Hess nephew in a pool spraining both ankles but is that what really happened. Linsey Davis is here. Reporter: It sounds plausible. Uncle jumps into pool to save his nephew from drowning. That's what usc cornerback josh Shaw says caused him to sprain both ankles but now new speculation he made it all up. And josh Shaw with a tremendous play. Reporter: New questions emerging this morning surrounding usc cornerback josh Shaw. The 22-year-old football player noticeably absent from practice Tuesday after telling the school he rescued his 7-year-old nephew from drowning on Saturday. We've gotten a few phone calls, contradicting what josh said occurred Saturday night so we're going to continue to vet it. Reporter: It's unclear who made those calls or what part of his story is being challenged. He says he suffered sprains in both ankles after jumping from the second story of an apartment complex in Palmdale, California, to save his nephew Carter who he says doesn't know how to swim. Josh's add perhaps with what occurred. Reporter: The fifth year senior says he landed on concrete before crawling into the pool steering his nephew to dry land before grabbing a ladder and lifting himself out of the water using just his arms. The x-rays and mris we have taken on him have come back negative so so far we don't see anything structurally wrong with him but he is very sore. Reporter: In an interview with ABC news his sister said she didn't witness the incident but was quick to be on his side. My child is safe and it's because of josh. Reporter: Shaw now surveillance from the game indefinitely, too injured to play, is being treated on campus. But says he would do it again for any child, not just his nephew. Josh Shaw has been a good leader for us. He's given me no reason not to believe what he has told us that occurred relationship the very same night of Shaw's alleged heroic rescue he was voted a team captain. He was expected to be a major player in the trojans' upcoming season. Shaw says his nephew is a bit traumatized but physically okay. Usc opens its season Saturday against Fresno without Shaw in the lineup. No word on when he'll be able to return but for now he may have bigger fish to fry.
This transcript has been automatically generated and may not be 100% accurate.