The bodies were found around 5:30 p.m. Monday at a house in the town of Angier.
Officials with the Johnston County Sheriff’s Office said the boy and girl were both just 14 years old. Their identities are not being released because of age.
While the boy was identified as a local high school student, a neighbor said the girl was homeschooled.
Deputies said the boy’s father was the one who found the bodies.
“He started crying, he was screaming in the front yard,” neighbor Cheyanne DeRossa told ABC11.
Police did not say who died as a result of murder and who committed suicide.