A couple of Tigers players are now free agents, according to this article:
As a formality, left-hander Jamie Walker and designated hitter/first baseman Matt Stairs filed for free agency Monday. First baseman Sean Casey is eligible to file before Nov. 12.
I would love to keep Walker in Detroit, as I think that he is a very good left-handed reliever. In 56 games last year Walker had a 2.81 ERA, going 0-1 in those appearances.