Capitals forward Carl Hagelin announces retirement from NHL - The Washington Post
Carl Hagelin retires at 35 due to an eye injury : r/hockey
Carl Hagelin Made a Habit of Knocking Off the Capitals. Now He Is One of Them. - The New York Times
Why Do Injuries Factor Into NHL Suspension Decisions?
Carl Hagelin: Breaking News, Rumors & Highlights
Capitals' Hagelin Has Surgery on Eve of NHL Opening Night – NBC4 Washington
Carl Hagelin retires from NHL due to 'severe' eye injury
Carl Hagelin 'a whole lot closer' to returning to Penguins lineup
Carl Hagelin's Eye Injury Could Threaten Career
Carl Hagelin is as important as he is frustrating - PensBurgh