Two Clearfield residents will spend the rest of their lives in federal prison for a package bombing that killed 34-year-old Shanna "Shawna" Carlson in October 2019. Prosecutors said the deadly blast grew out of an unpaid drug debt of roughly $1,000 and left her apartment building in ruins.
Federal Court Delivers Life Terms
The life sentences were handed down Wednesday in federal court, prosecutors said, according to WPXI. U.S. Attorney Troy Rivetti told the outlet the pair killed Carlson over a small drug debt and called the slaying unimaginably brutal. ATF Special Agent in Charge Eric DeGree was even more blunt, saying, "Kris Nevling and Clint Addleman are brutal murderers," according to the station.
Guilty Verdicts And Charges
A federal jury convicted Clint Addleman in March 2026 on charges that included possession of an unregistered destructive device, conspiracy to maliciously destroy property by explosive or fire, malicious destruction of property by explosive or fire resulting in death, and conspiracy to distribute methamphetamine, as detailed by the U.S. Department of Justice. His co-defendant, Kris Nevling, was found guilty in August 2025 of related explosives offenses and possession of an unregistered destructive device, according to the department.
The Blast That Leveled A Building
In the early morning hours of Oct. 4, 2019, a package addressed to Carlson's nickname was left outside her first-floor apartment at 327 E. Market St. in Clearfield and later detonated, killing her and sparking a fire that destroyed the multi-unit property, as reported by the Altoona Mirror. The explosion triggered a blaze that rendered the building uninhabitable and tore through the block's housing stock.
How Investigators Tied The Case Together
Federal and state agents used forensic techniques to match components of the explosive device and its packaging to Addleman and Nevling, and the ATF had previously posted a reward in the case, according to the ATF. The Department of Justice credited the ATF, the Clearfield Regional Police Department and the Pennsylvania State Police with piecing together the evidence that took the case to trial and ultimately secured the convictions.
Aftermath And Next Steps
Addleman had filed a petition earlier this summer seeking to vacate his guilty verdict, local coverage reported, but the July sentencings went ahead and now put both men behind bars for life. Prosecutors said the penalties mark the end of a long-running investigation into what they described as a brutal, calculated attack on a neighbor.
