NFL QB Michael Vick, who served 23 months in prison for running a dog fighting operation and has now signed with the Philadelphia Eagles, apologizes for a "horrible mistake."

At a news conference, Vick tells reporters that he is making efforts to work with the Humane Society.

"In the past, I made some mistakes, I've done some terrible things," he says. "I made a horrible mistake, Now I want to be part of the solution and not the problem."