Carlson died after a package delivered to her home exploded, resulting in a fire that totaled the two-story apartment building where she resided in Clearfield.

After deliberating about four hours Wednesday, the jury of seven women and five men gave their verdict to U.S. District Judge Stephanie L. Haines, who announced they found Nevling guilty of possession of an unregistered firearm/destructive device and conspiracy to maliciously destroy property by explosive/fire that resulted in death.

While Haines read the jury’s verdict, Nevling shook his head several times and appeared frustrated, while a woman in the gallery began to cry.

The verdict wrapped up an eight-day trial that laid out the circumstances surrounding Carlson’s death.

The remains of the residence at 327 E. Market St., Clearfield, where Shawna Carlson, 34, lived can be seen after a bomb and subsequent fire destroyed the structure. Courtesy photo

Prosecutors said Nevling, along with co-conspirator Clint Addleman, 48, of Morrisdale, constructed an explosive device that was delivered to Carlson because of a $800 debt she owed Addleman after a methamphetamine deal.

According to prosecutors, Addleman is considered the leader of the duo, and faces two additional charges of malicious destruction of property resulting in death and conspiracy to distribute methamphetamine. His trial is set for October.

During Nevling’s trial, prosecutors called a number of witnesses, including forensic pathologist Harry Kamerow from Mount Nittany Medical Center, who conducted the postmortem autopsy on Carlson in 2019.

Kamerow’s testimony provided details about the shards of hard black plastic found embedded in both Carlson’s body and the walls of her bedroom. The shards were consistent with shrapnel launched by an explosive device, testimony showed.

Kamerow said Carlson died before the fire, noting the lack of ash and soot in her throat.

This image shows the package addressed to Shawna Carlson using her nickname that contained a bomb. Courtesy photo

Matthew Regentin, a retired agent from the Bureau of Alcohol, Tobacco, Firearms and Explosives also testified about the investigation undertaken immediately following the blast.

He showed the jury security camera footage taken from the property immediately adjacent to Carlson’s apartment that showed a man placing a large box on the doorstep of her residence in the early hours of Oct. 4, 2019, and additional video from later that day that showed the explosion and subsequent fire as it consumed the structure.

Regentin said he and his fellow investigators had to use a large handheld sieve to shift through the rubble of the apartment to look for evidence, as the explosion and fire had reduced the building and its contents to a mound of ash and partially burnt debris.

In this process, he discovered a number of fragments of hard black plastic ranging in size from less than an inch to several inches long in both the bedroom of the apartment and the side yard immediately outside of the room.

These fragments later tested positive for explosive residue, he said.

Nevling was represented by attorneys Adam R. Gorzelsky and Brian D. Aston, both of Greensburg. The case was prosecuted by U.S. Attorneys Maureen Sheehan-Balchon from Johns­town alongside Shaun E. Sweeney and Samantha Stewart of Pittsburgh.

According to a news release from the U.S. Western District of Pennsylvania Attorney’s Office, Nevling could face up to life in prison and a $250,000 fine, while Addleman could receive life in prison plus a $1 million fine if found guilty.

He was remanded to federal custody to await sentencing before Haines on Jan. 7, 2026.

Gorzelsky said he was unsure if the defense team intends to appeal the verdict.

While originally set to be tried together, Nevling and Addleman ended up in separate trials at the request of Addleman’s attorney.

Mirror Staff Writer Conner Goetz is at 814-946-7535.