Te'o won seven national awards for his play and was runner-up for the Heisman Trophy. A couple of days before that award was presented, the linebacker had a call from the Kekua character saying she was alive.
Te'o, who has said he was deeply confused by that conversation, ultimately told his parents and coaches about the situation. Notre Dame said an investigation of Te'o's claims backed up his story and pointed to Tuiasosopo as the person behind the hoax. When asked by Katie Couric in an interview broadcast last week, Te'o said he is not gay.
Te'o and his family had no immediate comment on Friday.
In the McGraw interview, Tuiasosopo said he was the voice of Kekua, and provided samples to McGraw and a producer. One of those samples, McGraw said, was compared by three separate laboratories to recorded voice mails sent by Kekua to Te'o. They were a match, he said.
Tuiasosopo apologized to Te'o, Notre Dame, his own family and everyone else affected by the hoax during the interview.
"People say, 'Well, does he even have any feeling toward this?'" Tuiasosopo said. "The truth is, I hurt every day from the decisions that I made."