Police made the sensational announcement as Pistorius arrived for a third day of a bail hearing over the Valentine's Day shooting of his girlfriend Reeva Steenkamp, which prosecutors say was a premeditated killing and defence argues was an accident.
Lead detective Hilton Botha, whose testimony was challenged by defence attorneys on Wednesday, is facing seven attempted murder charges for shooting at a minibus taxi in 2009, police said.
Pistorius's lawyers tore into Botha's police work during Wednesday's hearing, undermining his witnesses and forcing him to agree that the Olympian's version of events fitted the crime scene.
"It sounds consistent," Botha, a prosecution witness, told the court.
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Pistorius vehemently denies the premeditated murder charges against him, claiming he mistook the 29-year-old covergirl for an intruder.
Despite gaining the upper hand on Wednesday, Pistorius's team still needs to give compelling reasons why he should be freed pending his trial, after having spent a week in detention already.
Lawyers for both sides are expected to wrap up arguments for bail on Thursday.