New details also show that a maintenance worker was in the apartment when the deadly stabbing happened in May.
Prosecutors said the 15-year-old allegedly planned was inspired by a recent documentary about the Menendez brothers and sent a photo of the crime scene via Snapchat.
"By the time that I realized I was in the air, and I thought to myself, 'I might die right now,'" said victim Hailea Soares.
A mother and her son were stabbed to death as they confronted a burglary suspect.
A 29-year-old man already charged in an attack on his parents has now been booked for murder, Raleigh Police said Monday evening.
Monica Moynan's best friend took the stand Thursday and said the missing Holly Springs mom came to her on two separate occasions saying she was choked and "almost died."
