Former Rangers captain Ryan Callahan diagnosed with degenerative back disease
Ryan Callahan - Wikipedia
What Ryan Callahan's career-ending injury means for the Lightning offseason - The Athletic
Lightning use second compliance buyout on Ryan Malone
Lightning winger Ryan Callahan diagnosed with degenerative back disease, hockey career likely over
Senators struck down by Lightning in overtime
Lightning's Ryan Callahan diagnosed with back disease
Lightning's Ryan Callahan announces retirement after 13 seasons
Marchand takes a licking, keeps on ticking Lightning off
Lightning's Ryan Callahan done playing because of back disease
Tampa Bay Lightning players re-imagined as Game of Thrones characters - Page 3
Ryan Callahan - Wikipedia
Tampa Bay Lightning Report: Did Ryan Callahan Back Himself Into A Corner? - Page 4
New Jersey Devils Trade Partner: Tampa Bay Lightning