The Blues re-signed defenseman Tom Koivisto yesterday. Koivisto started the season in St. Louis but was later demoted to Worcester, where he played 47 games. Koivisto scored 14 goals and had three assists. He was taken in the eighth round by the Blues in last year’s draft. With Koivisto under contract, defensemen Reed Low and Matt Walker are the only unsigned players. Pavol Demitra will be going to arbitration.