It was reported weeks ago that the Kansas City Chiefs would place the exclusive right tender on linebacker Josh Martin in order to keep him in Kansas City. The NFL's transactions list for Monday indicate that Martin has now signed that tender, meaning he's under contract for the 2015 season in Kansas City.
Martin doesn't play much defense at outside linebacker. There are a few players ahead of him, including Justin Houston (heard of him?), Tamba Hali and Dee Ford.
What Martin does do very, very well is special teams. Pro Football Focus had him with the highest overall grade for all special teamers in the NFL as well as leading kickoff coverage grading. You may not notice him or know his name but he is making an impact on Dave Toub's special teams unit.
Exclusive rights free agents are players whose contracts have expired but they have three or fewer years of experience in the league. Martin was among the Chiefs undrafted free agent signings following the 2013 NFL Draft. The Chiefs seem to like him considering he's stuck for two-plus years as an undrafted player.