The death of Allison Guerriero, a former FBI informant and ex-lover of disgraced agent Charles McGonigal, has been ruled a suicide, according to a source close to the investigation. Guerriero, 52, was found dead in her Boynton Beach, Florida, apartment on August 27, prompting speculation due to her past involvement in high-profile cases and public statements against the FBI.
The Palm Beach County Medical Examiner's office denied a request for the autopsy report, citing a Florida law that shields the privacy of suicide victims and their families by exempting such reports from public record. However, the source confirmed to the Daily Mail that suicide was determined to be the cause of death.
Guerriero's death occurred hours after she posted a series of messages on X, formerly Twitter, including a video of herself walking outside and another stating, "I hate the FBI." Her online activity also included demands for attention on other federal agents and a mention of PTSD related to 9/11.
Despite the official ruling, friends and family expressed disbelief. Guerriero's father, Bill, stated he had not seen the autopsy results and desired to know their findings. Close friend Roger Stone, a conservative lobbyist and ally of former President Trump, also voiced skepticism, noting his communications with Guerriero the day before and the day of her death suggested she was in good spirits. Stone, who had hired a private investigator to look into her death, stated he found it difficult to believe she would take her own life, given her devout Catholicism.
"Characterizing her as a 'mistress' is, I believe, unfair in that I believe McGonigal misled her about the status of his marriage," Stone added. "She was a brilliant researcher and writer with an excellent knowledge of both law enforcement and our intelligence capabilities and wide network of contacts. She was widely respected in that world."
Security consultant Jackie Singh, who had published a critical article about Guerriero the day before her death, expressed sadness and noted it was "tough to reconcile with the alleged timing of her passing." Singh had been in contact with Guerriero leading up to the article's publication. In a text message to an independent researcher, Guerriero obliquely referenced the potential impact of Singh's article, writing, "I don't wanna wreck your life like they did to me."
Guerriero was instrumental in exposing the crimes of Charles McGonigal, a former special agent in charge of the FBI's New York counterintelligence division. McGonigal was convicted of secretly working for Russian oligarch Oleg Deripaska, who has ties to Vladimir Putin. Guerriero had an 18-month affair with McGonigal, during which she discovered evidence of his illicit activities, including $80,000 in cash she found in their apartment, which McGonigal claimed was from a baseball bet. McGonigal is currently serving a 6.5-year prison sentence.
In text messages disclosed in Singh's article, Guerriero expressed awareness of the dangers of her position, stating, "As if I don't have the same concerns? I turned in a traitor working for the Russians. They don't scare me. If they wanted me dead I'd be dead five or six years ago." She also mentioned concerns about surveillance and past involvement in drug trafficking investigations.
Guerriero met McGonigal in 2017 while volunteering for a charity. He was then a high-ranking FBI agent. She later accused him of lying about his marital status and flaunting their relationship within FBI offices. After their breakup on Christmas Eve 2018, Guerriero began sharing her suspicions with the FBI in 2019, though she felt her concerns were initially dismissed. McGonigal was arrested in January 2023.