A league source tells us in response to our item regarding the potential departure of offensive coordinator Mike Martz in Motown that Martz will be out, and that his potential replacement already has been lined up.

We’re working on getting the name of the guy who is slated to take Martz’s place.

The lack of offense down the stretch, the lack of a running game, and the bad personnel decisions for guys he wanted (Tatum Bell, George Foster, & others) are the reasons he will be gone,” the source said.  “It’s a done deal.”

Martz took the position with the Lions after being fired by the Rams, with the goal of cleaning up an image that was in tatters after a series of problems during his tenure as the successor to Dick Vermeil.  Martz hoped to parlay a strong performance into another head-coaching job, but he’s no closer to serious consideration than he was two years ago.