FBI DALLAS IDENTIFIES SUSPECT BEHIND SEVEN THREATENING WHITE POWDER LETTERS SENT TO U.S. GOVERNMENT OFFICIALS

DALLAS, TEXAS — The Federal Bureau of Investigation’s Dallas Field Office announced on November 13, 2026, that investigators have identified the individual responsible for mailing seven threatening letters containing white powder to senior United States government officials, their family members, or both. The investigation, which began in February 2024, remained unresolved through conventional investigative methods until FBI personnel employed Investigative Genetic Genealogy (IGG) to establish the identity of the sender. Federal authorities identified the individual as William Earl Cade, who died in April 2026, before investigators publicly announced the resolution of the case.

According to the FBI, the investigation began when a sealed envelope leaking an unidentified white powder was discovered in February 2024. Investigators subsequently determined that seven similar letters had been mailed from the Dallas area. Each contained white powder accompanied by violent threats directed toward high-ranking federal officials, their family members, or both. The discovery prompted a federal investigation into the origin of the correspondence and the individual responsible for sending the threatening material.

Laboratory testing established that the powder contained in the letters was not hazardous, eliminating the immediate concern that recipients had been exposed to a dangerous substance. The threatening messages nevertheless remained central to the investigation because the correspondence targeted individuals connected to the federal government. Although the FBI confirmed that the material was harmless, the letters’ threatening content and the circumstances surrounding their delivery required investigators to determine who had sent them.

A forensic handwriting assessment provided investigators with an important connection between the seven letters. Examiners concluded that the correspondence had probably originated from a single individual, allowing authorities to examine the incidents as part of a connected series rather than unrelated threats. The handwriting findings supported the investigative effort to identify a common sender, but conventional methods did not establish that person’s identity.

After exhausting traditional investigative approaches, the FBI turned to Investigative Genetic Genealogy, a specialized forensic technique that combines genetic information with genealogical research to identify individuals associated with investigative evidence. The method can help investigators develop potential identities when conventional records and forensic comparisons have not produced a definitive lead. Genetic genealogy has become an important resource in certain unresolved criminal investigations, particularly cases where biological evidence remains available but the responsible individual cannot be identified through established investigative databases.

Through the application of IGG, federal investigators identified William Earl Cade as the person responsible for sending the threatening correspondence. The FBI did not publicly specify the biological evidence used in the genetic genealogy analysis, the precise investigative process that established Cade’s identity, or the circumstances surrounding his death. The agency confirmed that Cade died in April 2026, approximately seven months before the November announcement identifying him as the sender.

Investigators also examined whether additional individuals had participated in the mailing campaign. According to the FBI Dallas Field Office, the available evidence indicates that Cade acted alone, and authorities have not identified any additional suspects connected to the seven letters. The determination resolves the central question of who sent the correspondence, although Cade’s death prevents any criminal prosecution against him.

The case demonstrates the expanding role of investigative genetic genealogy in federal criminal investigations extending beyond the violent offenses and unidentified remains cases commonly associated with the technique. In this investigation, the method provided an identification after handwriting analysis and other traditional investigative procedures failed to establish the sender’s identity. The result illustrates how advances in forensic identification can support investigations involving threatening correspondence and other offenses where conventional methods leave significant unanswered questions.

The FBI began using Investigative Genetic Genealogy in March 2018 and has since assisted in resolving nearly 250 cases across 30 states. Those cases reflect the Bureau’s growing investment in specialized forensic capabilities that can help identify individuals connected to criminal investigations and provide investigative leads for longstanding unresolved cases.

FBI Dallas established its own Investigative Genetic Genealogy program in 2020 and currently maintains four dedicated teams working directly with local law enforcement partners. The teams provide specialized assistance to agencies investigating cold cases and other matters where genetic evidence may offer opportunities to identify suspects or resolve outstanding investigative questions. The program represents an additional investigative resource for law enforcement agencies confronting cases that have remained unresolved despite extensive investigative work.

The identification of Cade marks the conclusion of a federal investigation that began more than two years earlier with the discovery of a suspicious envelope. Authorities established that the white powder posed no hazardous threat, connected the seven letters through handwriting analysis, and ultimately identified their sender through genetic genealogy. With no additional suspects identified and the individual responsible now deceased, the FBI’s November 13 announcement provides the first public resolution of the case.

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