Oscar Pistorius was the target of a scam in which a man posing as a prosecution official offered to quash the former track star's murder conviction in exchange for $US16,400 ($A21,400), South African police say.
Police say the 33-year-old man was arrested on Friday next to a Pretoria courthouse after receiving an initial payment of $US2600 in a police sting operation.
They say the man faces corruption charges.
A police statement says the man accused of masquerading as a National Prosecuting Authority official promised "to have Oscar Pistorius' murder case destroyed".
In a statement, Pistorius's family commends police for their "swift and efficient" handling of the case.
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South Africa's highest court dismissed Pistorius's appeal against his murder conviction for the death of girlfriend Reeva Steenkamp.
Sentencing is scheduled for April 18.
