Josefson, 23, had one goal and three points in 27 games last season.
The 20th pick in the 2009 NHL Draft, Josefson has seven goals and 25 points in 118 games over parts of four seasons. He had one assist in six Stanley Cup Playoff games during the Devils' run to the Stanley Cup Final in 2012.
This is a great day for me. This is something I've been thinking about for a long time. This is a great opportunity that the St. Louis Blues organization, (owner) Tom Stillman and Doug Armstrong are giving me and trusting me in doing...This is going to be a great challenge for me.
— Martin Brodeur, after announcing his retirement as an NHL player and becoming a senior adviser with the Blues on Thursday