Cancer survivor Allison Guerriero dies after posting anti-FBI messages online

Allison Guerriero ended her life inside her rented apartment in Boynton Beach, Florida, on August 27. Friends and family insisted they could not accept this outcome. They believed a cancer survivor would never take her own life. The Daily Mail can now reveal the truth behind the mysterious death of Charles McGonigal's former lover.

Guerriero was found dead hours after posting videos on X where she demanded attention for other federal agents and declared, 'I hate the FBI.' She posted about walking in the street and criticizing law enforcement officials before her body was discovered around 8pm that evening. Police responded to the scene shortly after these messages were shared online.

The Palm Beach County Medical Examiner refused to release an autopsy report. They cited a Florida law protecting suicide victims and their families from public records requests. A source close to the investigation confirmed to the Daily Mail that suicide was the cause of death, but offered no further details on how it happened or if foul play occurred.

Her death came just one day after security consultant Jackie Singh published an article on Hacking, but Legal that heavily criticized Guerriero's actions and involvement with McGonigal. The article dissected her life and questioned her behavior regarding the 58-year-old former FBI chief.

Guerriero had an 18-month affair with McGonigal while he served as special agent in charge of the FBI's New York counterintelligence division. Her cooperation helped expose his crimes, including secretly working for Russian oligarch Oleg Deripaska who has close ties to Vladimir Putin. McGonigal is now serving 6.5 years in prison after losing his job and reputation.

Her father Bill told reporters he felt left in the dark because he had not seen the autopsy results yet. He stated plainly that he would like to know what the medical professionals have to say about the official findings. Close friend Roger Stone, a high-profile Florida conservative lobbyist and ally of President Trump, expressed deep shock at the news.

Stone said based on his communications with her before she died and her devout Catholicism, he still had trouble believing she took her own life. He hired a private investigator to look into the death while Guerriero was researching for him right up until the end. Stone noted it is impossible for an independent investigator to reach an alternative conclusion without access to medical records or autopsy evidence. It remains possible that her death was accidental despite the official ruling.

Stone added that at this point her family deserves privacy and he intends to comment no further on the matter. He described her as a great and talented friend who faced difficult choices during a tense time. Characterizing her as merely a mistress is unfair because McGonigal likely misled her about the status of his marriage before she entered into their relationship.

She is gone now, and he told the Daily Mail right away: "I heard from her by text on the day she passed away and she seemed in excellent spirits. They were work related." He added that Allison 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 Singh said after being told the latest news: "I am saddened to learn that Ms Guerriero may have taken her own life in the wake of my story about her statements and background." Immediately following the death, he noted: "What I saw was a person who was highly destabilized by the notion that I was going to drop this piece. But I'm disturbed right now." He asked if somebody whacked her but concluded it did not seem so. Most likely she whacked herself. Oh man.

Guerriero and Singh had been in contact leading up to publication, with the former sending three text messages on the day she died. Part of the final one read obliquely: "I don't wanna wreck your life like they did to me." Security consultant Jackie Singh's blog post on her website, Hacking, but Legal, published the day before Guerriero died, was hugely critical of Guerriero, who later reacted to it on X. Singh later reacted to Guerriero's death on X, admitting it's been "tough to reconcile with the alleged timing of her passing."

Guerriero's death certificate, obtained by the Daily Mail, does not reveal the cause of death because it is the short form version available to the public. In Florida, longer versions available to family do reveal that information. Her passing came hours after she shared a flurry of 75 posts on X, including a video of herself walking in the street demanding a spotlight on other Feds and another where she declared: "I hate the FBI." They were part of her unrelenting years-long campaign often conducted on social media against married McGonigal and her personal war against other senior figures in the agency. She was also clearly aware of the dangers of crossing swords with Moscow after the link to one of President Putin's cronies was revealed.

Her inner thoughts were revealed in text messages with independent researcher Anthony Gonzales, who posts information under the name Anthony Andrews. They were disclosed in Singh's piece. Gonzales asked her about reprisals and she replied: "As if I don't have the same concerns? I turned in a traitor working for the Russians." She stated that they did not scare her. If they wanted me dead I'd be dead five or six years ago. I'm assuming they have wires up on my comms as well as Albania, Bosnia, Croatia, Serbia etc... And definitely Mexico and Colombia because of past drug trafficking investigations I was a contractor on.'

Guerriero said in another text to Gonzales: "I work with the military, law enforcement and the intelligence community. We always say 'nobody would even believe us if we told them these stories'." And she claimed regarding McGonigal's downfall: "But I did pick up a lot of trade habits that enabled me to know how to collect the right evidence on Charlie. And it was hard." McGonigal is serving six years in federal prison but Guerriero always believed he should have received a harsher sentence, telling the Daily Mail in 2024: "He's a traitor."

On the day of her death, she posted a selfie video of her strolling in Boynton Beach saying: "Hey, good morning everybody. Friends and enemies… of course I'm in the middle of all my PTSD from 9/11 but I'm actually breathing a huge sigh of relief…" She continued with: "Here's the problem with Charles McGonigal. You know his name, but you never did before that. You knew Jim Comey's name. You knew Chris Wray's name.. all the names that you already know, you know." Guerriero was found dead at her Boynton Beach apartment on August 27 at the age of 52.

Why don't you start looking for the names that you do not know?" asked Guerriero. She was once a vice president of US operations for Israeli security firm Mifram while working in New York. Her path crossed with McGonigal in spring 2017 when she volunteered for the Federal Enforcement Homeland Security Foundation charity. The then $200,000-a-year Fed wooed her over dinner, claiming he was going through a divorce from wife Pamela who he called 'a nag' who never agreed to sex. Guerriero was also close to Roger Stone, the Florida-based conservative lobbyist and ally of President Trump. Stone reacted to her death on X at the time, saying Guerriero was 'upbeat, happy, and fully engaged in her work,' when he spoke to her the day of and before her death. His family home was in Chevy Chase, Maryland, but he lived in a sublet apartment in Park Slope, Brooklyn following his 2016 New York appointment by then-FBI director Comey.

In the three years before her death, Guerriero was exclusively interviewed several times by the Daily Mail, spilling on the couple's sex life and McGonigal's treachery. While they were living together in his Brooklyn apartment, McGonigal flaunted his relationship with Guerriero, taking her into the FBI's main office in Manhattan and up to what she calls the 'Kings of New York' floor – introducing her as his 'girlfriend.' He cleverly masked signs of his overall treachery, passing off any outward clues as part of his role. He took a trip to Albania during their relationship in 2017 and at one point asked Guerriero to accompany him to meet sanctioned metals magnate Deripaska. According to court papers, on October 5 McGonigal received $80,000 from his former Albanian intelligence official associate in a car parked outside a New York restaurant. Weeks later, Guerriero made a startling discovery in their apartment. A bag containing what she now knows was $80,000 in $100 bills, neatly rolled. 'My mind went to them being what we call flash rolls, money you would give an undercover informant or an undercover agent for them to continue operating in the field,' she told the Daily Mail.

McGonigal worked for the FBI from 1996 until his retirement in 2018, and from 2016 until he left the bureau he was the special agent in charge of the FBI's Counterintelligence Division in the New York field office. Guerriero's affair helped blow the lid on McGonigal's crimes, which included secretly working for Russian oligarch Oleg Deripaska who had been under US sanctions since 2018. Challenged, McGonigal claimed he had won the money betting on a baseball game. Guerriero listened patiently but was suspicious. However, it was McGonigal's confession that he was not divorcing his wife that led to their breakup on Christmas Eve, 2018 – three months after he retired from the FBI and later became an $850,000-a-year head of security for a bank. Guerriero tipped off people she knew at the FBI about her suspicions in 2019 after reflecting on events. Her accusations appeared to have fallen on deaf ears, although the wheels of justice obviously did begin to turn on McGonigal and he was arrested in January 2023. 'After Charlie and I had broken up, I had spent a series of weeks and months rolling everything over in my head,' she said. 'And it had occurred to me, this guy's a traitor. Every time I tried to talk to the FBI about it, they didn't want to listen.