Herschel Walker is going to be a MMA fighter.

Herschel Walker, MMA fighter (katchop)

Herschel Walker has had many roles in his life, from dominant college football player to author of a book about his mental health problems.

Along the way there was a stint as one of the faces of the United States Football League and a decade-long career in the N.F.L. He also competed in the 1992 Olympics in the bobsled.

At age 47, he is taking on a new challenge: mixed martial arts.

Walker has signed a multifight contract with Strikeforce, an MMA organization that is trying to challenge the Ultimate Fighting Championship.