The San Diego Chargers continue to secure their young nucleus with long-term deals after reaching an agreement with standout cornerback Quentin Jammer on a five-year contract extension on Tuesday night. Combined with the two seasons that Jammer had remaining on the original six-year contract he signed as a rookie in 2002, the extension means that the former first-round pick is under contract through 2012. The extension is worth about $30 million in addition to the years remaining on his current contract and it includes bonuses totaling $13.5 million. "Quentin is a major part of our defense," general manager A.J. Smith said in a statement released by the team. "He gets better every year. It's exciting to know he will continue to be a Charger. He's a true pro. He works year-round and has a great work ethic. He's tough and physical. He's a terrific run supporter and cover guy. The best is yet to come."