While Greg Biffle’s private jet crash in December is still under investigation, more layers have already been added to a case shrouded in mystery. A few weeks after the family’s demise, the break-in at their house, however lowly and disturbing an act, initially looked like a one-off incident. But investigators now believe there was far more going on behind the scenes, with suspicious financial activity adding another layer to the case. And with public attention around Biffle’s family and estate continuing to grow, the U.S. government has now stepped in to help local authorities piece together what may have really happened.

“As part of our financial investigative mission, the U.S. Secret Service is assisting the Iredell County Sheriff’s Office with the bank fraud aspect of this case,” Steven Gutierrez, Special Agent in Charge of the U.S. Secret Service’s Charlotte Field Office, wrote in a statement.

The investigation into Greg Biffle’s family has significantly escalated as a result of this confirmation, transforming what at first seemed to be a localized event into a federal investigation. Authorities are now looking into alleged financial crimes that go far beyond the January break-in at the Biffle family’s Mooresville home. Court records reviewed by WBTV revealed that the Secret Service’s Cyber Investigations Section, a unit that typically handles cybercrime and financial payment fraud, has been assisting local authorities with “personnel, assets, and investigative support.”

More than $30,000 in cash and two firearms were reportedly taken from the home in the weeks after Greg Biffle’s terrible plane crash in neighboring Statesville. However, that was only the beginning. Investigators claim that “hundreds of thousands of dollars” may have been embezzled from the family’s bank accounts before the break-in, according to court filings.

Detectives allege the suspicious activity actually began within hours of the Dec. 18 crash, with phone numbers, passwords, and email addresses on accounts tied to Greg Biffle and his wife, Cristina Grossu, allegedly being changed almost immediately afterward. Authorities are also investigating unauthorized Venmo activity and fraudulent checks reportedly linked to accounts belonging to the family.

This is where the Cyber Investigative Section of the Secret Service comes into play. It is a division of the organization that is usually in charge of dealing with intricate financial crimes and online fraud. Their participation raises the possibility that there is more to this case than merely a physical break-in.

One search warrant affidavit went even further, with an Iredell County detective writing, “It is the belief of this affiant that a plan has been in place by friends of Gregory Biffle and strategically executed after the death of the Biffle family.” Investigators also alleged that the fraud appeared to be “a strategic and coordinated strike” carried out across multiple states by people who had “intimate knowledge” of the family’s personal and financial information.

In the meantime, investigators have been developing their case in a number of ways. Investigators reportedly employed face recognition technology through a Secret Service contractor to help identify a prime suspect after security footage from the break-in revealed a masked person entering the house. Later, search warrants were carried out at properties connected to that person in Denver and Mooresville.

According to investigators, surveillance footage showed the suspect moving through the property with apparent familiarity with the home’s layout and camera locations, adding to suspicions that the person may have known the family personally. License plate reader data and interviews with people connected to the Biffles have also reportedly become part of the investigation.

Authorities have nevertheless exercised caution. They have made it clear that the case doesn’t hinge solely on facial recognition, but also includes interviews and additional evidence gathered along the way. Court filings stated that the biometric analysis found “twenty-eight eye-biometric correlations, including six assessed as high-confidence,” though officials stressed that the technology was only one part of a broader investigation. And with no arrests made yet, the investigation remains wide open and increasingly complex. “As this is an ongoing investigation, we are unable to provide additional comments beyond what was released in court documents,” Gutierrez added.

The widening probe has unfolded alongside other legal troubles connected to the tragedy. Greg Biffle’s estate is currently facing two wrongful death lawsuits filed by the family of pilot Dennis Dutton and his son Jack, who also died in the crash. The lawsuits reportedly seek more than $30 million in damages and allege improper maintenance of the aircraft, though the official cause of the crash has still not been determined.

But, even as investigations continue to swirl, Biffle’s legacy was given a poignant moment of acknowledgment.

Greg Biffle’s legacy honored

 One of North Carolina’s greatest civilian honors, the Order of the Long Leaf Pine, was given to Biffle posthumously by Josh Stein this week.

Although racing accolades would be sufficient to justify the distinction, there was more to it than that. Biffle established a reputable career at the top level of the sport and won 19 races in the NASCAR Cup Series. Across NASCAR’s top three national series, he amassed more than 50 victories while also winning championships in both the Truck Series and Xfinity Series. But what stood out in the governor’s remarks was something else entirely: his actions away from the track.

Greg Biffle reportedly flew several life-saving missions during Hurricane Helene, utilizing his resources and expertise to assist those in imminent danger. That side of him, often less publicized than his racing résumé, became central to the recognition. Biffle’s niece, Jordyn, who now oversees his estate, accepted the award on his behalf

Team USA Olympic skeleton athlete and former Queens University heptathlete, Mystique Ro, and veteran Davidson College basketball coach Bob McKillop were among the other well-known figures inducted at the ceremony by Stein. Still, Greg Biffle’s inclusion carried a different emotional weight given the circumstances.

And that contrast is hard to ignore. On one hand, a decorated career and a legacy being honored at the highest level. On the other hand, an active investigation surrounding his estate continues to raise questions. For now, both exist side by side.