A Alabama A teenager accused of killing five members of his family had previously tried to poison his stepmother with peanut butter, a new court filing reveals.
Before the then 14-year-old Mason Wayne Sisk allegedly fatally shot his parents and three siblings – including his little brother – he had tried to poison his stepmother by putting peanut butter in her coffee because he knew she was allergic authorities.
The harrowing murders reportedly came after 19-year-old Sisk found out his stepmother wasn’t his biological mother. The September 2019 massacre shook the small town of Elkmont.
The new file also alleges that Sisk threatened his father and was violent with his three young half-siblings, News19 reported.
Sisk is also accused by prosecutors of stealing jewelry from his stepmother and grandmother.
He faces one count of murder involving two or more victims and three counts of murder involving a victim under the age of 14. Sisk will appear in court for a pretrial hearing on August 12.
Before then-14-year-old Mason Wayne Sisk (left) allegedly fatally shot his parents and three siblings — including his little brother — he had tried to poison his allergic stepmother, Mary Sisk (right), with 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 five-year-old half-sister Aurora (right).
On the day of the alleged crimes, around 11 p.m. on September 2, 2019, Sisk called 911 to report a shooting.
The then 14-year-old boy initially told responding MPs he was in the basement of his family’s home on the 2500 block of Ridge Road in Elkmont when he heard gunfire upstairs.
According to investigators, Sisk later confessed to killing his family and led officers to the murder weapon, a 9mm handgun that was legally at the home.
The victims of the shooting 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 five-year-old half-sister Aurora.
The fifth victim was Sisk’s father, John Sisk, 38. The massacre followed the revelation that Mary Sisk was not Mason Sisk’s biological mother
Sisk first told responding MPs that he was in the basement of his family’s home on Block 2500 of Ridge Road in Elkmont when he heard gunfire upstairs
According to investigators, Sisk later confessed to killing his family and led officers to the murder weapon, a 9mm handgun that was legally at the home
According to a 2020 report by a juvenile probation officer, Sisk had “showed no sign of remorse” for allegedly committing the gruesome crimes.
The document received from WELL says, ‘Mason doesn’t seem resentful that he’s being accused of murdering his family… During his incarceration he didn’t talk about his family at all.’
Sisk’s parole officer found that aside from multiple warnings and two misconduct offenses, mostly for speaking without permission, the teen had been a model inmate.
“While in custody, Mason follows orders, does his homework, and interacts well with others,” the report said.
Sisk’s cousin Daisy McCarty told the broadcaster WEAPON in 2019 that she believed the murders were sparked by a revelation that Mary Sisk was not his birth mother.
“He didn’t know otherwise who his mother was. And they just told him recently, and I think that really triggered the little boy, to be honest,” she said.
Sisk had also gambled by burning live animals and breaking into his school in the months leading up to the murders, she said.
Mary Sisk, originally from 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 at the time that she was needed,” said Evon Miller, whose granddaughter was in Mary’s class WZDX in 2020.
John Sisk held a variety of jobs, including at a Harley-Davidson dealership, and graduated from a Paul Mitchell cosmetology school.
