Lieuwen has retired from professional hockey due to ongoing concussion issues, Elliotte Friedman of Sportsnet reports.

Lieuwen sustained a severe concussion on April 6, 2014 when he was hit in the head by Philadelphia's Jay Rosehill as he was coming across the goal crease. Lieuwen experienced some of the common symptoms of a concussion, but he suffered from a more uncommon one as well -- his vision was completely thrown off and since then, he has never been able to track the puck as easily as he could before the incident. It's an unfortunate story, especially considering the goalie is just 25 years old, but the silver lining is that Lieuwen said he plans to stay involved with hockey, perhaps becoming a goalie coach sometime in the near future.