Alabama boy, 15, 'has shown no remorse' in year since he 'shot dead his parents and three young siblings when he learned his stepmom wasn't biologically related to him'

A 15-year-old Alabama boy has been charged as an adult with capital murder for allegedly killing five members of his family execution-style, including his infant brother, as newly released court documents have revealed that the suspect has shown no remorse for the killings. 

More than a year after the September 2019 massacre that rocked the small town of Elkmont, the Limestone County Sheriff's Office last week identified Mason Wayne Sisk as the suspected killer. 

Sisk, who was 14 years old when he allegedly killed his father, stepmother and three young half-siblings by shooting each of them in the head, 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. 

Mason Sisk, 15, from Alabama, has been charged as an adult with five counts of capital murder for the September 2019 killings of his family

Mason is suspected of shooting in the head his father, John Sisk, 38 , and his stepmother, Mary Sisk, 35 , purportedly after learning she was not his birth mother 

Mason also allegedly executed his three half-siblings (L to R): Grayson, 6; Colson, 6 months, and Aurora, 5  

Sisk remained held without bond in the county jail as of Friday afternoon. 

According to a report from a juvenile probation officer, Sisk 'has not shown any sign of remorse' for allegedly committing the atrocities 15 months prior, just days after learning that his mother was not his biological parent.  

The document that was obtained by WAAY states: 'Mason does not seem bothered by the fact he’s accused of murdering his family... While in detention, he has not talked about his family at all.'

Sisk's probation officer noted that, other than getting several warning and a pair of disciplinary infractions, mostly for talking without permission, the teenager had been a model inmate at the Tennessee Valley Juvenile Detention Center,   

'While in detention, Mason follows directions, does his schoolwork and interacts well with others,' the report reads.

In deciding to transfer Sisk's case to from juvenile to adult court, a judge said there is no evidence that the 15-year-old belongs in a mental health institution.

The case began unfolding at around 11pm on September 2, 2019, when Mason Sisk called 911 to report a shooting. 

The then-14-year-old boy initially told responding deputies that he had been in the basement of his family's home in the 2500 block of Ridge Road in Elkmont when he heard gunfire upstairs.

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

The victims of the shooting were identified as Mason's 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, aged five.

Mason called 911 and summoned deputies to his family's home in Elkmont, Alabama 

After initially lying to the cops, Mason reportedly confessed to the killing and led deputies to the murder weapon 

Mason's cousin Daisy McCarty told the station WAFF last year she believes the killings were sparked by a revelation that Mary Sisk was not Mason's birth mother.

'He didn't know any different of who his mom was. And they just recently told him, and I think that's really what triggered the little boy, to be honest with you,' she said.

Mason also had been acting out in the months preceding the murders by burning live animals and breaking into his school, she said.

Mary Sisk, originally from New Orleans, was a special education teacher for Huntsville City Schools, according to a biography on the website of Mountain Gap Schools. 

'I can’t think of any better person to be with us during the time she was needed,' Evon Miller, whose granddaughter was in Mary's class, told WZDX. 

John Sisk had a number of jobs, including at a Harley Davidson shop, and had graduated from a Paul Mitchell cosmetology school.