Federal juries convicted Clint Addleman and Kris Nevling in the 2019 bombing death of 34-year-old Shanna Carlson.
JOHNSTOWN, PA — Two Pennsylvania men were sentenced to life in federal prison Wednesday for constructing a package bomb that killed a Clearfield woman who owed one of them about $1,000 for drugs, federal prosecutors said.
U.S. District Judge Stephanie L. Haines imposed the sentences on Clint Addleman and Kris Nevling, both 49. Separate federal juries convicted the men of conspiring to destroy property with an explosive or fire and possessing an unregistered destructive device. Jurors also found that their conspiracy caused the death of 34-year-old Shanna Carlson, who was also known as Shawna.
The bombing happened on Oct. 4, 2019, at a multi-unit rental property on East Market Street in Clearfield, about 100 miles northeast of Pittsburgh. Trial evidence showed that Addleman and Nevling helped each other build and possess a bomb before concealing it inside a package addressed to Carlson using her nickname.
The package was left outside the door of Carlson’s first-floor apartment at about 4:30 a.m., according to evidence presented during the trials. The device later exploded inside the apartment, killing Carlson and starting a fire that destroyed the building. Prosecutors said Carlson owed Addleman an outstanding drug debt of about $1,000.
Addleman was found guilty in March after a seven-day trial. In addition to the two charges shared with Nevling, jurors convicted Addleman of malicious destruction of property by an explosive or fire resulting in death and conspiracy to distribute methamphetamine. The jury deliberated for about two hours before returning its verdict.
Evidence in Addleman’s trial established that the drug conspiracy operated between January and October 2019. Prosecutors said Addleman supplied methamphetamine to customers in and around Clearfield, including Carlson and Nevling. The jury found that Carlson’s death resulted from both the bombing conspiracy and Addleman’s destruction-of-property offense.
Nevling was convicted in August 2025 after his separate trial. His jury deliberated for about four hours before finding him guilty of conspiracy and possession of the unregistered destructive device. Jurors also determined that Carlson’s death resulted from the conspiracy offense.
U.S. Attorney Troy Rivetti said the two men killed Carlson over a small drug debt. Rivetti said the life sentences ensure that Addleman and Nevling will remain in prison for their conduct. He also credited local, state and federal investigators who worked on the case.
Eric DeGree, special agent in charge of the Bureau of Alcohol, Tobacco, Firearms and Explosives’ Philadelphia Field Division, said investigators used forensic tools to uncover the conspiracy. The Clearfield Regional Police Department, Pennsylvania State Police and Allegheny County Sheriff’s Office also assisted in the investigation.
The case was prosecuted by Assistant U.S. Attorneys Maureen Sheehan-Balchon and Samantha A. Stewart and Special Assistant U.S. Attorney Shaun E. Sweeney. Both defendants have now been sentenced following jury convictions, concluding the principal federal proceedings announced in the bombing case.
Author note: Last updated July 23, 2026.