Source: Matt Niskanen is retired from hockey regardless of paper status
Capitals trade Matt Niskanen to Flyers for Radko Gudas
Philadelphia Flyers: Players can lean on Matt Niskanen during playoffs
Meltzer's Player Profiles: Matt Niskanen
Niskanen to have hearing for actions in Flyers game
It's almost playoff time and Matt Niskanen has lessons to teach Flyers
Niskanen announces retirement from NHL
NHL Daily Picks: Brooks Orpik, Matt Niskanen return to Pittsburgh - CBSSports.com
Flyers' Matt Niskanen unexpectedly retiring | Yardbarker
Flyers See Matt Niskanen Retire, Extend Justin Braun to Help Fill the Hole
FLYERS MATT NISKANEN HANGS 'EM UP, PASSING ON $5.75 MILLION! | Fast Philly Sports
Flyers Acquire Matt Niskanen In Trade With Capitals For Radko Gudas - CBS Philadelphia
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MELTZER: Getting the Job Done
Flyers' Matt Niskanen plans to play like hell. He showed Friday he's willing to go through it | Mike Sielski
Matt Niskanen: Defenseman decides to retire after 13 NHL seasons
Flyers Playoff Player Review: Matt Niskanen
Women's Washington Capitals #2 Matt Niskanen Red Adizero Player Home Jersey
Matt Niskanen receives touching tribute from Capitals in return to D.C. - NBC Sports RSN
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Flyers' defenseman Matt Niskanen is leading by example
