Teen charged with killing family had ‘tried to kill stepmum with peanut butter’

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A teenager who is on trial for killing his family had previously tried to poison his stepmother with peanut butter, said prosecutors.

Mason Wayne Sisk, 16, from Alabama is accused of murdering his father John Sisk and stepmum Mary Sisk, along with his three siblings, six-year-old Grayson, five-year-old Aurora and six-month-old Colson.

He allegedly put peanut butter in Mary’s coffee knowing she was severely allergic, after discovering they weren’t biologically related.

This was before he supposedly shot the five of them dead in September 2019, when he was just 14.

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Prosecutors revealed the disturbing accusation in court records that also indicated he had threatened his father and had “anger control” issues regarding his three younger half-siblings.

Mason is also accused of stealing two rings from his stepmother – who was a special education teacher – which he later sold.

The teenager is being tried as an adult and prosecutors maintain he stole a handgun from his grandmother’s house prior to the gruesome murders.

All five victims were shot in the head, execution-style, the authorities reported.

The alleged crimes took place on September 2, 2019, with Mason calling 911 and telling police he had been in the basement when he heard gunfire shots upstairs.

According to investigators, he later confessed to killing his family and led officers to the murder weapon, a 9mm pistol, which was legally held at the residence.

Mason pleaded not guilty to the killings in April 2021 and he’s due back before a judge on August 12. H

He faces one count of capital murder of two or more victims and three counts of capital murder of a victim under the age of 14.

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Prosecutors have yet to release a motive in the massacre, but previously released court documents indicate Mason has shown no remorse while awaiting trial.

“Mason does not seem bothered by the fact he’s accused of murdering his family,” his juvenile probation officer wrote in a November 2020 report.

“He has not shown any sign of remorse. While in detention, he has not talked about his family at all.”

Mason’s cousin Daisy McCarty told radio station WAFF that Mason has been burning live animals and breaking into his school before the killings took place.


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