The deal is worth a reported $2.5 million, according to Aaron Portzline of the Columbus Dispatch.
The 28-year-old, who was set to become an unrestricted free agent this summer, is enjoying potentially his best season in the NHL. Through 34 games, he has nine goals and 20 points. His best offensive season came in 2010-11 when he had 14 goals and 27 points with the Pittsburgh Penguins in 64 games.
Letestu was acquired by the Blue Jackets for a fourth-round pick in the 2012 NHL Draft in a trade with the Penguins in November 2011.
I'm just excited about the opportunity. I've been on the ice earlier than usual and in the weight room, pushing around a little more weights than usual. Every day I go into a workout with a smile on my face and ready to go. When you do have a little more responsibility, you want to take your lunch pail and get ready to work.
— Brian Elliott to Jeremy Rutherford of the Post-Dispatch on being the Blues' No. 1 goalie