HENDERSON, Nev. — Five-time Pro Bowl wide receiver Amari Cooper retired Thursday, a little more than a week after signing a one-year contract to return to the Las Vegas Raiders. Raiders offensive coordinator Chip Kelly said Cooper called coach Pete Carroll on Thursday morning and gave him the news. "It's unfortunate because I think the world of him," Kelly said. "I think he's a heck of a football player. He's had a heck of an NFL career, but he knows in his heart what he wants

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