NEW YORK (AP) -- Michael Vick says he cried in prison because of the guilt he felt about being involved in dogfighting.
In an interview with "60 Minutes" that aired Sunday night, Vick said the day he walked into prison he realized "the magnitude of the decisions that I made.
"And, you know, it's no way of, you know, explaining, you know, the hurt and the guilt that I felt. And that was the reason I cried so many nights. And that put it all into perspective," he said.
A three-time Pro Bowl pick during six seasons with the Atlanta Falcons, Vick served 18 months in federal prison for running a dogfighting ring and was reinstated last month by the NFL after being out of action since 2006.
He signed with the Philadelphia Eagles on Thursday.