An teenager accused of killing five members of his family had previously attempted to poison his stepmother with peanut butter, a new court file reveals.Before allegedly fatally shooting his parents and three siblings - including his infant brother - execution-style, then-14-year-old Mason Wayne Sisk had tried to poison his stepmother by putting peanut butter in her coffee, knowing she was allergic, according to authorities. The harrowing murders allegedly ensued after Sisk, 19, found out his stepmother was not his biological mother. The September 2019 massacre rocked the small town of Elkmont.
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