Before he allegedly fatally shot 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 with principles. The gruesome murders allegedly followed when Sisk, 19, discovered his stepmother was not his biological mother. The September 2019 massacre shocked the small town of Elkmont. The new filing also alleges that Sisk threatened his father and abused his three younger half-siblings, News19 reported. Sisk is also accused by prosecutors of stealing jewelry from his stepmother and grandmother. He faces one count of murdering two or more victims and three counts of murdering a victim under the age of 14. Sisk will appear in court on August 12 for a preliminary hearing. Before he allegedly fatally shot his parents and three siblings — including his brother — execution-style, then-14-year-old Mason Wayne Sisk (left) had tried to poison his allergic stepmother, Mary Sisk, (right) by putting peanut butter . in her coffee, according to authorities Sisk is also accused of fatally shooting his two half-brothers, six-month-old Colson (center) and six-year-old Grayson, (right) and his half-sister Aurora, age five (right) On the day of the alleged crimes, around 11:00 PM on September 2, 2019, Sisk called 911 to report a shooting. The then-14-year-old boy initially told responding deputies he was in the basement of his family’s home in the 2500 block of Ridge Road in Elkmont when he heard gunshots upstairs. According to investigators, Sisk later confessed to killing his family and led officers to the murder weapon, a 9mm handgun, which was legally kept at the residence. The shooting victims have been identified as his father, John Sisk, 38. his stepmother, Mary Sisk, 35; his two half-brothers, six-month-old Colson and six-year-old Grayson, and his half-sister Aurora, five. The fifth victim was Sisk’s father, John Sisk, 38. The massacre followed the revelation that Mary Sisk was not Mason Sisk’s birth mother Sisk initially told responding deputies he was in the basement of his family’s home in the 2500 block of Ridge Road in Elkmont when he heard gunshots upstairs. According to investigators, Sisk later confessed to killing his family and led officers to the murder weapon, a 9mm handgun, which was legally kept at the residence. According to a 2020 report by a juvenile probation officer, Sisk had “shown no sign of remorse” for allegedly committing the heinous crimes. The document obtained by WAAY states, “Mason does not seem bothered by the fact that he is accused of murdering his family … While in custody, he has not spoken at all about his family.” Sisk’s probation officer noted that, aside from several warnings and two disciplinary infractions, mostly for speaking without permission, the teenager was a model inmate. “While in custody, Mason follows directions, does his schoolwork and interacts well with others,” the report states. Sisk’s cousin Daisy McCarty told station WAFF in 2019 that she believed the murders were sparked by a revelation that Mary Sisk was not his birth mother. “He didn’t know who his mom was otherwise. And they told him recently, and I think that’s what really set the little boy off, to be honest with you,” he said. Sisk also acted out in the months leading up to the killings by burning animals alive and breaking into his school, she said. Mary Sisk, a native of New Orleans, was a special education teacher for Huntsville City Schools, according to a biography on the Mountain Gap Schools website. “I can’t think of a better person to be with us as long as it took,” Evon Miller, whose granddaughter was in Mary’s class, told WZDX in 2020. John Sisk held several jobs, including a Harley Davidson dealership, and graduated from a Paul Mitchell cosmetology school.
