The FBI agent who analysed the digital footprint of Idaho mass murderer Bryan Kohberger has disclosed how the killer's deliberate attempt to erase his online activity ultimately helped prove his guilt. Jeff Tanzola, a supervisory special agent at the FBI's Philadelphia field office, told a conference that large amounts of data were missing from Kohberger's phone and laptop when he examined them in 2023.
“A lot of times when you get a phone, you get a computer, there’s a lot of evidence that just jumps off the screen at you. This was not the case with that. It was the complete opposite of that,” Tanzola said at the Cellebrite C2C User Summit. Kohberger had apparently tried to enact a digital blackout during the night of the murders of four University of Idaho students on 13 November 2022.
Forensic experts identified that the blackout was one of only four periods of total inactivity on Kohberger's devices since June 2022. However, the killer's plan backfired. Tanzola, alongside Heather Barnhart and Jared Barnhart of Cellebrite, discovered a pattern of voids in his digital trail leading up to the murders. One void occurred on the night of the killings.
“He didn’t just lose signal or run out of battery. This was an actual button press, power off, on purpose, and then a power back two hours later. And in the middle of that, four people were killed,” Jared Barnhart explained. The digital evidence was crucial in demonstrating premeditation and bolstered DNA evidence from a knife sheath found at the crime scene.
Kohberger was arrested on 30 December 2022 at his parents' home in Pennsylvania. He pleaded guilty in July 2025 to the murders of Kaylee Goncalves, Madison Mogen, Xana Kernodle, and Ethan Chapin, and was sentenced to life in prison, avoiding the death penalty. Tanzola noted that the partnership with Cellebrite was key to uncovering the digital evidence that helped build the case.
