Oscar Pistorius — Arrested in 2009 for Assaulting a Woman

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Olympian Oscar Pistorius — who now stands accused of murdering his girlfriend — was arrested in 2009 for allegedly assaulting a female friend … our sources has learned.

Boschkop police in South Africa tell our sources … Pistorius spent 24 hours in jail following his 2009 arrest … before the alleged victim decided to drop the charges.

Pistorius is currently being held at a nearby Pretoria Prison.

According to Boschkop police, Oscar and his girlfriend Reeva NEVER had any prior incidents … at least where cops were called.

Pistorius is set to appear before a judge tomorrow.