Update: The New York Daily News claims that "Local media" are reporting that the teen was a "home schooled teen [who] wasn’t allowed to play video games, and that his family never let him watch violent shows on television." We're not sure of the validity of that part of the NYDN story because it's a third-hand account. Thanks Andrew Eisen for passing that bit along.
Original Story: A 15-year-old New Mexico teen gunned down his entire family and then told police that he was heavily involved in video games, mentioning "Modern Warfare" and "Grand Theft Auto" by name, according to U.S. News (on NBC). The teen, Nehemiah Griego from Albuquerque, allegedly shot and killed his 40-year-old mother Sarah, 9-year-old brother Zephania, 2-year-old sister Angelina, 5-year-old sister Jael, and later his 51-year-old father Greg.
Nehemiah did not give a motive for the crime beyond saying that he was frustrated with his mother, according to authorities, who also said that the teen opened up about his love for video games when given the opportunity.
"It was kind of what he was into and was quite excited as he got the opportunity to discuss that with investigators," Bernalillo County Sheriff Dan Houston said a news conference.
Police did not say how the conversation steered towards video games in the first place.
Police also said that the teen planned the murders a week ago. He also allegedly planned to kill his girlfriend's parents and shoot up a local Walmart, but abandoned the second part of his plan. Ultimately he wanted to die in a firefight with police. They also said that his father had trained him how to shoot, and that he had four guns: a .22 rifle with a 10-round clip, an AR-15 semiautomatic rifle and two 12-gauge shotguns. Some of the guns had been purchased by "his father's friends and sold to the father privately," according to police.
The teen will be arraigned in Albuquerque on Tuesday afternoon. Police said that the teen was not using drugs or alcohol and that he had never been treated for mental illness to the best of their knowledge.
You can get more details in this news conference footage about the crime.