Two residents of Clearfield, Pennsylvania, were sentenced on July 22 to life imprisonment in federal court after being convicted of conspiracy to maliciously destroy property by explosive or fire and possession of an unregistered destructive device related to a targeted bombing that killed a woman over a drug debt, according to United States Attorney Troy Rivetti.
United States District Judge Stephanie L. Haines imposed the sentences on Clint Addleman, 49, and Kris Nevling, 49. The convictions followed separate jury trials—Nevling’s in August 2025 and Addleman’s in March 2026. The jury also found Addleman guilty of malicious destruction of property by explosive or fire resulting in death and conspiracy to distribute methamphetamine. Both juries determined that the victim’s death was caused during the commission of these offenses.
“Clint Addleman and Kris Nevling callously took the life of Shanna Carlson—someone who Nevling later testified in court was among his best friends—in one of the most violent and brutal manners imaginable, all over a small drug debt,” said United States Attorney Rivetti. “They were convicted of their crimes by two separate juries. Today’s sentencings ensure that Addleman and Nevling will both spend the rest of their lives in prison for their ruthless, violent conduct. Our office remains resolute in working closely with our law enforcement partners at the local, state, and federal levels to prosecute those who seek to commit such heinous crimes in our communities.”
“Kris Nevling and Clint Addleman are brutal murderers,” said Eric DeGree, Special Agent in Charge of the ATF’s Philadelphia Field Division. “Together they staged a deadly explosion to try to hide their crime. Working methodically with our federal, state, and local partners, and applying ATF’s unique forensic tools, we exposed their conspiracy and they now face long sentences in federal prison for their crime.”
Trial evidence showed that around early October 2019, Addleman and Nevling constructed a bomb concealed inside a package addressed using Carlson’s nickname. At about 4:30 a.m. on October 4 that year, the package was delivered outside Carlson’s apartment door on East Market Street in Clearfield; later that morning it detonated inside her apartment, killing her instantly and destroying the building by fire. Evidence indicated Carlson owed Addleman approximately $1,000 for drugs.
Assistant United States Attorneys Maureen Sheehan-Balchon and Samantha A. Stewart as well as Special Assistant United States Attorney Shaun E. Sweeney prosecuted this case for the government.
United States Attorney Rivetti commended investigative efforts from multiple agencies including the Bureau of Alcohol, Tobacco, Firearms & Explosives (ATF), Clearfield Regional Police Department, Pennsylvania State Police, and Allegheny County Sheriff’s Office.