San Francisco brought back coach Mike Singletary, but it decided Tuesday not to retain offensive coordinator Mike Martz, a league source said.

The two sides — the 49ers and Martz — met Tuesday morning to finalize the arrangement that many expected. They still were finalizing it Tuesday afternoon as another league source said it was “99.9 percent” certain that Martz would be gone. It’s not that Singletary didn’t like Martz; he did. Others within the organization did not want Martz to coach San Francisco’s offense moving forward.

Now Martz is on the street again, for the second straight year. Last year, he and Detroit parted ways, and now he and San Francisco have done the same.