According to ESPN.com reports:
The Pittsburgh Steelers and veteran cornerback Ike Taylor have reached an agreement on a four-year deal, a league source told ESPN NFL Insider Adam Schefter.
Details of the contract have not been disclosed. This was the Steelers most important signing this offseason. The Steelers secondary struggled against pass-happy defenses last season and Ike Taylor is the best CB they have until the young rookies get some experience.