Defensive tackle Joe Cohen was waived today. He hurt his knee over the weekend, and the injury is apparently serious enough that he is headed to injured reserve. The Lions have to let him pass through waivers first, but assuming no team claims him, he will likely be put on IR.
With a roster spot opening up, the Lions decided to re-sign Robert Callaway, who was just released on Saturday. Since Cohen's injury created a need for extra depth at defensive tackle, bringing Callaway back made the most sense.