IRVING, Texas—Roy Williams headed home to Texas on Tuesday in the NFL’s biggest trade before the deadline, giving the struggling Dallas Cowboys another proven receiver opposite Terrell Owens.

The winless Detroit Lions traded their unhappy 2004 first-round pick and one-time Pro Bowler for three draft picks, from the first, third and sixth round in 2009. Detroit also gave the Cowboys a seventh-rounder next year.

Cowboys owner Jerry Jones said he struck the deal two minutes before the NFL trade deadline.

“I’m more happy to be a Dallas Cowboy then when I got my ...

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