Prosecutors had considered charging the radio personalities with manslaughter in the death of Jacintha Saldanha, but concluded that there was not enough evidence, The Daily Telegraph reported.
Saldanha was the nurse at the King Edward VII hospital in London who forwarded a call to the room where a pregnant Kate Middleton was after the DJs tricked her into believing the call was from Queen Elizabeth.
The nurse killed herself three days later.
Malcolm McHaffie, the deputy head of special crime for the Crown Prosecution Service, said Friday his office has weighed charging the two with violations of communications and data protection laws but decided prosecution would not be in the public interest.
The two, Mel Greig and Michael Christian, made tearful apologies for the prank, but have been off the air since the death of Saldanha.