Ms. Veselnitskaya also appears to have recanted her earlier denials of Russian government ties.
But newly unearthed emails show she worked closely with the Kremlin's chief legal office to derail a Justice Department civil fraud case against a well-connected Russian firm. Veselnitskaya admitted to being hacked and told Russian news agency Interfax that people are trying to discredit her, and that she will be reporting the hack to Russian authorities.
She confirmed an active relationship with Russia's prosecutor general.
"Many things included here are from my documents, my personal documents", Veselnitskaya said. "I am a lawyer, and I am an informant", Veselnitskaya told NBC News after reporter Richard Engel confronted her with copies of the emails in a forthcoming interview to be aired on Friday.
Goldstone told Donald Trump Jr. that "the crown prosecutor of Russia" was offering "to provide the Trump campaign with some official documents and information that would incriminate Hillary and her dealings with Russian Federation and would be very useful to your father". It seems she's changed her tune, and she told NBC she was an informant for Russian Federation.
Veselnitskaya has denied having connections to the Kremlin since her meeting with then-candidate Donald Trump's son, son-in-law and campaign chairman.
But the e-mails, which were provided to RFE/RL, show her communicating with Sergei Bochkaryov, a top official in the office of Prosecutor-General Yury Chaika, about an official government response to a US legal request.
But on Friday, Natalia Veselnitskaya blew a hole in that narrative. A Russian court convicted him of the fraud a few years after he died in a Moscow prison in November 2009 after alleged beatings and medical negligence.
This acknowledgement contradicts Veselnitskaya's previous statement in November to the Senate Judiciary Committee as part of its investigation of Russian involvement in the 2016 presidential election. "I have no relationship with Mr. Chaika, his representatives and his institutions other than those related to my professional functions as a lawyer".
The email was sent by former campaign surrogate and British tabloid journalist Rob Goldstone, explaining the use of the English term for a prosecutor general.
An organization established by an exiled Russian tycoon says it has obtained emails showing collaboration between Russian government officials and the Russian lawyer who met with Donald Trump Jr.in 2016.
"She said, 'Well, I have a dual role, I'm a private attorney and I'm an informant.' From there on, she backtracked".