Jackson is in line to replace inside linebacker Pat Angerer in Indy's starting lineup. Angerer acknowledged earlier this week he had been given a "heads up" he would not be re-signed by the team.
Jackson is an upgrade for the Colts, albeit a surprisingly expensive one. The 34th overall pick in the 2006 NFL Draft, Jackson led the Browns in tackles each of the past three seasons and was universally hailed as a respected team leader. The new Colts linebacker was No. 47 on Around The League's list of the top 101 free agents.