Sources: Alex Smith Signs Extension

ESPN is reporting that the Kansas City Chiefs have signed Alex Smith to a four-year contract extension.

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ESPN and various media reports have the extension worth about $68 million. The Kansas City Star was the first to report the news.

"It was a priority of ours to get this deal done and keep Alex in a Chiefs uniform long-term," Kansas City general manager John Dorsey said in a statement. "Alex is a proven leader on and off the field. He is a special individual with a lot of ability, and we are fortunate to have him here."

The Chiefs acquired Smith last year in a trade with the San Francisco 49ers. The Chiefs gave up second-round draft picks in 2013 and 2014. Smith has one year remaining on his current deal, so the extension keeps him in Kansas City through 2018.

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Last year, in his first season as the Chiefs' starter, Smith threw for a career-best 3,313 yards and 23 touchdowns.