The 27-year-old Janssen spent the last three-plus seasons with the St. Louis Blues after being traded by the Devils in exchange for defenseman Bryce Salvador on Feb. 26, 2008. Janssen had 1 goal, 3 assists and 131 penalty minutes in 54 games with the Blues in 2010-11.
In 95 games with the Devils spanning two seasons (2005-06 and 2006-07), Janssen had 1 goal and 205 penalty minutes.
Janssen's agent, Kevin Magnuson, confirmed to Tom Gulitti of The Bergen Record that the deal with the Devils came not long after the Devils traded Pierre-Luc Letourneau-Leblond to Calgary for a 2012 fifth-round draft choice on Thursday afternoon.
"(Cam) is very excited to be back with Lou (Lamoriello) and the Devils," Magnuson told Gulitti. "It's a great opportunity for Cam with Pierre being traded earlier in the day."
When we started our journey we made a commitment to our fans to be relevant and to see the Chicago Blackhawks become the best professional hockey organization. There are not two finer symbols of that than Jonathan Toews and Patrick Kane. The commitment we have made to these incredible young men is equal to the commitment they have made to our team, our fans, our entire organization and the city of Chicago.
— Chicago Blackhawks owner Rocky Wirtz on signing Jonathan Toews and Patrick Kane to contract extensions