Hi there, welcome to the forum!
Yes, unfortunately Chris is injured at the moment and will probably be out of play for the rest of the season. The cause for this is his knee, that recieved a bad hit in a game recently.
In the beginning of the season he did not perform that well, but after about 15 games he had transformed into one of the best performing defencemen in the team. After some games at that stable level, he got injured.