Allison Guerriero, the security researcher whose tip to federal investigators helped bring down former FBI counterintelligence chief Charles McGonigal, was found dead at her home in Boynton Beach, Florida, on August 27, 2026. She was 52.
Boynton Beach police officers responded to her apartment in the 1499 block of South Federal Highway shortly after 8 p.m. after friends and family raised concerns for her welfare, according to Hoodline. Police said officers found no initial signs of foul play, and the department is awaiting a report from the Palm Beach County medical examiner before determining a cause of death. The investigation remains open.
Who was Allison Guerriero
Guerriero was in an approximately 18-month romantic relationship with McGonigal, who ran the FBI’s counterintelligence division in New York before his 2023 arrest. She alerted federal investigators after noticing McGonigal carrying large sums of cash and maintaining ties to foreign-connected individuals; when she asked him about the money, he reportedly told her he had won it on a baseball bet, according to Newsweek. Her tip helped launch the federal investigation that uncovered McGonigal’s undisclosed work for Russian oligarch Oleg Deripaska.
McGonigal pleaded guilty to conspiring to violate U.S. sanctions law by working for Deripaska and to concealing $225,000 in cash he received from a person connected to the Albanian government. He was sentenced to a combined roughly six and a half years in prison across two federal cases. At his sentencing, the judge cited Guerriero’s “extraordinary contributions” to the counterintelligence case against him.
What she posted before she died
In the hours before her death, Guerriero posted roughly 75 messages and videos on X, urging followers to investigate unnamed federal officials and writing in one post that she hated the FBI, according to Hoodline and posts reviewed on X. She had grown increasingly public in the years after the McGonigal case, giving interviews and posting online about what she described as continued retaliation and inaction from federal agencies.
Her father, William Guerriero, told The Gateway Pundit he did not believe she died by suicide, citing her Catholic faith, and said he suspected an accidental fall or a sudden medical emergency. The family said it was waiting on an official death certificate.
No cause of death has been confirmed. Boynton Beach police have said only that the medical examiner’s findings are pending, and no additional details about her death, or any connection to her past disclosures about McGonigal, have been substantiated.
