The Miami Dolphins have announced the signing of free agent safety Tyrell Johnson.
Terms were not disclosed.
A 2008 second round pick out of Arkansas State by the Minnesota Vikings, Johnson has started 27 of 49 games over the last four seasons, totaling 123 tackles and a pair of interceptions. Most of Johnson's production came within his first two seasons in the NFL, as he's started just five of 18 games over the last two seasons.
Johnson played in less than 10 percent of the Vikings' defensive snaps in 2010 and 30 percent of the snaps last season, during which Johnson was arrested for suspicion of driving under the influence and landed on injured reserve with a torn hamstring in November.
In addition to signing Johnson, the Dolphins announced that linebacker Austin Spitler had signed his "exclusive rights" tender.