Richardson was cut by the St. Louis Rams after two seasons. The former seventh-round pick showed promise as a rookie in 2012, rushing 98 times for 475 yards -- an impressive 4.8 average. His production dropped dramatically last season (only 215 yards and a 3.1 average), but a patchwork offensive line might have contributed.
The Jets already have added Chris Johnson to their backfield, giving them good depth. They also have Chris Ivory, Bilal Powell and Mike Goodson, who will attempt to return from major knee surgery and still faces a gun-possession charge from his arrest last May.
There is no guarantee Richardson will make it to training camp, but if he does, it won't bode well for Goodson's chances of sticking around.
UPDATE: To make room for Richardson, the Jets informed running back Alex Green of his release. Green announced it on Twitter.