SAN DIEGO — Chargers defensive end Luis Castillo has agreed to a five-year contract extension through 2014 valued at more than $43 million.

The deal, announced today, will pay Castillo a guaranteed $17.5 million in signing and roster bonuses.

Castillo's contract had been due to expire after the 2009 season.

"Since his arrival, Luis has played a huge role in the success we've had as a defense," general manager A.J. Smith said in a statement. "He's an ascending player who is committed to getting better."

Castillo was the second of the Chargers' two first-round draft picks in 2005. He has 13 sacks in 36 career games, including 33 starts.