News: Harrison announced his retirement on Wednesday, saying he is through hitting quarterbacks after a 15-year career for the New England Patriots and San Diego Chargers. Later Wednesday, NBC announced that Harrison will join its NFL studio show.
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Impact: The 36-year-old Harrison holds the NFL record for defensive backs with 30 1/2 sacks. He also has 34 interceptions, making him the only player to have at least 30 of each. But the numbers only tell part of the story about a player who had a reputation as one of the hardest hitters in the league - and one of the dirtiest, too.