Here is the ninth in an 18-part series examining the Chicago Bears' unrestricted free agents.
Name: Sherrod Martin
Position: Safety
Age: 31
NFL experience: Six years
2015 salary: $569,705 (prorated veteran minimum over 12 games)
2015 key statistics: One tackle; Five special teams tackles in 12 games
Probability to return: Low
Outlook: Martin has a lot of history with head coach John Fox, whom he also played for in Carolina -- Martin started 36 games for the Panthers from 2009-11.