Dolphins RB Foster: 'Walking away in peace'

Miami Dolphins running back Arian Foster is calling it quits.

Foster -- who signed a one-year deal with the Miami Dolphins in July -- posted a letter on The Uninterrupted announcing his retirement.

"There comes a time in every athlete's career when their ambition and their body are no longer on the same page. I've reached that point," Foster said.

Foster was a four-time Pro Bowler for the Houston Texans before signing with Miami. He finishes his career with 6,257 rushing yards and 54 touchdowns.

"This game has been everything to me...my therapy, my joy, my solace and my enemy. I've learned to love every facet of this game, from the peak of accomplishment to the gutter of criticism, " Foster…