Brian Shelleby pleaded guilty to third-degree murder and aggravated arson after the Castle Shannon blaze killed Lakyn Shelleby and injured her mother.
CASTLE SHANNON, Pa. — A Pennsylvania father has been sentenced to 15 to 30 years in prison after admitting responsibility for a house fire that killed his 19-year-old daughter and severely injured his estranged wife nearly a year earlier.
Brian Shelleby, 47, received the sentence Sept. 10 after pleading guilty in August to third-degree murder and aggravated arson in the death of Lakyn Shelleby. He also received a concurrent sentence of five to 10 years for aggravated arson and was credited with 361 days already served, according to local court coverage. The negotiated plea ended a case that had been headed toward a trial on a first-degree murder charge.
The fire broke out on the morning of Sept. 14, 2025, at the family home in Castle Shannon, a borough in Allegheny County near Pittsburgh. Investigators said Brian Shelleby and his estranged wife, Carly Shelleby, had been arguing about whether he could continue staying at the residence while they were separated. Authorities said he poured gasoline through portions of the home before the property erupted in flames.
Carly Shelleby escaped but suffered severe burns. Lakyn, who was home from college, became trapped inside and died at the scene. Firefighters and neighbors attempted to reach her as the fire spread through the house. A firefighter also suffered smoke inhalation during the response and was taken to a hospital, according to reporting from the time of the fire.
Brian Shelleby was detained at the scene and initially faced charges that included criminal homicide, aggravated arson and causing or risking a catastrophe. Police said after the fire that he admitted causing the blaze. The criminal case later moved toward trial before prosecutors and the defense reached a negotiated plea agreement in August 2026.
Under the agreement, Shelleby pleaded guilty to third-degree murder and aggravated arson causing bodily injury. Other counts, including additional arson-related charges, were withdrawn as part of the plea. His attorneys said after the plea hearing that he had accepted responsibility for what happened. They also said the ignition occurred when gasoline fumes encountered a pilot light from an appliance.
Several relatives addressed the court before sentencing. Carly Shelleby described the lasting impact of the fire and the loss of her daughter, while other family members also spoke about Brian Shelleby and the effect the case had on the family. Brian Shelleby did not personally address the court, according to WTAE, but defense attorney Phil DiLucente read a statement in which Shelleby apologized to his family and expressed remorse.
Lakyn Shelleby was a University of Pittsburgh student and a graduate of Keystone Oaks High School. Her obituary said she was born July 16, 2006, in Pittsburgh and died Sept. 14, 2025. She was remembered for her interest in music, athletics and martial arts and for the close relationships she maintained with friends and family.
Neighbors who spoke with local news organizations after the fire described Lakyn as a familiar member of the Castle Shannon community. She had recently begun her sophomore year at the University of Pittsburgh and regularly returned home on weekends. Community members gathered after her death to leave flowers and remember the 19-year-old as her family dealt with both her loss and Carly Shelleby’s injuries.
The sentencing came nearly one year after the fatal fire and about one month after the guilty plea. The 15-to-30-year prison term resolved the principal criminal charge against Brian Shelleby without the first-degree murder trial that had previously been expected. His aggravated-arson sentence will run at the same time as the murder sentence.
With sentencing completed, Shelleby is serving the prison term imposed in the negotiated case. Lakyn Shelleby’s family continues to memorialize her a year after her death, while the criminal prosecution that followed the Castle Shannon fire has concluded with her father’s guilty plea and sentence.
Author note: Last updated September 17, 2026.