The Brooklyn district attorney's office has exonerated a lawyer convicted of voting fraud 20 years ago. 

NY1 reported on it first Wednesday.

Acting DA Eric Gonzalez cleared John O'Hara. 

He was prosecuted on charges he used his girlfriend's address to vote in 1996. 

The controversial prosecution was carried out by former DA Charles Hynes.

O'Hara maintained it was a vendetta against him for campaigning against Hynes' political allies. 

He was found guilty in 1997 after three trials, making him the first person convicted of illegal voting since Susan B. Anthony in 1872.