The  Bears signed defensive tackle Sedrick Ellis to a one-year contract in June. He didn’t report to training camp Wednesday and has since advised them that he will retire, the team announced.Ellis, a former USC standout, was taken by the Saints with the seventh-overall pick of the 2008 NFL Draft, but never lived up to his lofty first-round status. At 28, he is young by NFL standards, and had no known health issues.Ellis started 70 games over five seasons for the Saints where he had 98 career tackles, 12.5 sacks, and 14 passes defended.