They did not release terms of the deal, but a source told ESPN.com's Pierre LeBrun that the contract is for eight years, $56 million with an annual average of $7 million.
Talks with the 21-year-old defenseman had seemed to run their course earlier this month, as general manager Dean Lombardi told LeBrun that his club had gone as far as it could with its last offer. While Lombardi wouldn't confirm what that offer was, sources confirmed to ESPN.com that it was seven years and $6.8 million per season in average -- the same annual pay as Anze Kopitar, the team's leading scorer the past four seasons -- but Doughty's representatives were reportedly looking for $7 million per season and fewer years on the contract.
Doughty is among the NHL's top young defensemen after three seasons with the Kings. The Canadian Olympic gold medalist became the second-youngest Norris Trophy finalist in league history in 2010 after scoring 59 points.
Information from ESPNLosAngeles.com's Dan Arritt and The Associated Press was used in this report.