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Witnesses describe 'non-stop' argument night of shooting in Pistorius' home

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Top Talkers: Witnesses describing the night Olympic runner Oscar Pistorius allegedly shot his girlfriend Reeva Steenkamp say the couple had a "non-stop" argument before the shooting. The Morning Joe panel -- including the Council on Foreign Relations' Dan Senor, Fortune's Leigh Gallagher, Mike Barnicle and economic analyst Steve Rattner -- discusses Pistorius and reports that Apple was hit by hackers.