Neighbors said they saw the first police cars and ambulances arrive at the home Saturday night. The road was blocked and word of the shootings began to make its way through the neighborhood.
According to the probable cause statement, Nehemiah Griego first told a staff member at Calvary that his family was dead and that he placed the two rifles in the family van as protection before driving to the church. He later changed his story, according to the detective's statement.
Asked if he had told anyone else about murdering his family, Griego allegedly told the detective that he had taken a picture of his dead mother and sent it to his girlfriend.
Sheriff Dan Houston plans to hold a news conference Tuesday morning, and the teen could make his first court appearance in the next day or two.
Associated Press writer Paul Davenport in Phoenix contributed to this report.
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