Source: Seahawks sign Fred Jackson

— -- The Seattle Seahawks have agreed to terms with free-agent running back Fred Jackson on a one-year deal, a source told ESPN Insider Adam Schefter.

Jackson, 34, was released by the  Buffalo Bills after averaging a career-low 3.7 yards per carry last season, but his 66 catches were a career high.

Seahawks running back  Marshawn Lynch and Jackson have a great relationship from their days in Buffalo, but head coach Pete Carroll said earlier this week that didn't have anything to do with the team's interest.

"Only in that I know that Marshawn and he are very good friends, and they get along, and that's always a good thing," Carroll said. "But other than that, that didn't feed into this. He's just a heck of a football player that might be able to find a role. Depends on how things are going. We've gotta check and see how we're doing on our injuries and stuff."