Justin Mohn bought the gun the day before the murder, according to the Bucks County district attorney.
Police in Washington state are searching for a person of interest in the death of a woman whose beheaded body was found near a bunker loaded with firearms and ammo.
A killing in northwest Houston left a woman nearly decapitated and her boyfriend in jail.
A 27-year-old motorcyclist has been identified after he was decapitated in a bizarre accident at an intersection in San Bernardino, California, authorities said.
A 38-year-old man convicted of murdering his live-in boyfriend, dismembering him and dumping his severed head, hands and feet near the Hollywood sign has been sentenced to 25 years to life in prison.
The Islamic State group released a graphic video on Sunday in which a black-clad militant claimed to have beheaded U.S. aid worker Peter Kassig, who was captured last year