Pistorius' Lawyer Suggests 'Chaos and Contamination' at Scene

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Oscar Pistorius' lead defense lawyer Barry Roux raised questions about the police investigation during the Olympian's murder trial on Tuesday.

The track star is accused of premeditated murder after fatally shooting his girlfriend Reeva Steenkamp on Valentine's Day last year. Pistorius, 27, insists he mistook the model and law graduate for an intruder.

The trial continues.