Crown prosecutor Margaret Cunneen will not be charged over allegations raised by the Independent Commission Against Corruption, the Attorney-General has been advised.

In a blow to the ICAC, NSW Solicitor-General Michael Sexton, SC, said in a statement on Friday he had considered the advice of the Victorian Chief Crown Prosecutor in forming the view no prosecution should be brought.

The corruption watchdog had referred evidence to the NSW Director of Public Prosecutions after its inquiry into Ms Cunneen, SC, her son Stephen Wyllie and his girlfriend Sophia Tilley was aborted by the High Court, which found the watchdog was acting outside its statutory powers.

The commission said the evidence related to allegations the trio had been involved in an attempt to pervert the course of justice after a car accident in May last year, and had provided "false evidence" to the watchdog.