The Miami Dolphins signed two free-agent running backs following the injury to Alexander Mattison, who is out for the season.

The Dolphins are doubling down on running back additions in the wake of Alexander Mattison's season-ending neck injury.

The Dolphins signed Boone to a contract Monday. With Alexander Mattison (neck) being placed on injured reserve, the Dolphins bolstered their backfield Monday by adding Boone and Aaron Shampklin. Boone ...

In the wake of losing Alexander Mattison to a season-ending neck injury, the Dolphins moved quickly to add running back depth Monday, signing veterans Aaron Shampklin and Mike Boone. To make room on ...