Oklahoma Stabbing: Brothers Plead Not Guilty to Allegedly Stabbing Parents, Siblings
08/03/2015 AT 03:00 PM EDT
Robert Davis Bever, 18, and Michael John Bever, 16, were each charged with five counts of first-degree murder in the vicious July 22 killings of their parents, David, 52, and April, 44, their two brothers, Daniel, 12, Christopher, 7, and their five-year-old sister Victoria inside their Broken Arrow home, according to charging documents obtained by PEOPLE.
The brothers were also charged with one count of assault and battery with intent to kill involving the stabbing attack on their 13-year-old sister who survived the carnage.
At a Monday court hearing, a Oklahoma judge entered not guilty pleas for the brothers, who appeared on a video monitor from the Tulsa County Jail. Robert could face the death penalty if convicted. Younger brother Michael was charged as an adult but won't face the death penalty because of his age.
On July 22, officers responded to a 911 call at 11:30 p.m. in the 700 Block of Magnolia Court in Broken Arrow. The caller told 911 that they needed help because their brother was attacking their family, according to a police report obtained by PEOPLE.
Officers arrived at the home and discovered blood on the front porch and heard a faint voice from inside asking for help. Officers went inside and discovered the brother's 13-year-old sister lying bleeding on the floor with multiple stab wounds.
"The girl was still alive and made statements to the Officers that her brothers were responsible for attacking her and her family, the report states.
Police searched the home and found the bodies of their parents and siblings in different areas of the home. A 2-year-old girl was found in the home unharmed.
The brothers fled the scene but officers quickly found fresh footprints in the backyard leading towards a wooded area. They were chased down by a K-9 officer and arrested on suspicion of murder.
Authorities told KTUL that Robert showed no signs of remorse for the killings and claimed the murders were "just the beginning" of a series of killings planned outside the family. The extent of these plans remains unclear.
Police recovered multiple weapons used in the killings from the home, including various knives and a hatchet.
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