Two Broken Arrow brothers are accused of killing five of their family members and sending another to the hospital.
The question on the minds of many following the gruesome crime scene is how something so terrible could happen.
Although investigators haven't released a motive, psychiatrists say the 18 and 16 year olds must have gone through something traumatic which lead them to snap.
Not even 24 hours ago, the Bever family was at their home together, alive. Now, two brothers are behind bars at the Broken Arrow Police Department and their parents and three of their siblings are dead.
One by one the bodies were taken out of the Bever Broken Arrow home; at the same time, detectives questioned 18-year-old Robert Bever and his 16-year-old brother.
Police still aren't sure of the motive but said Robert's mug shot is pretty revealing.
"You know, his demeanor, I haven't had any contact with the deputies that are actually in charge of interviewing the suspect, but the mug shot, he has a smirk on his face, so that kind of tells you exactly what's probably, I don't know if there's any remorse whatsoever based on that picture," said Corporal Leon Calhoun, BAPD.
Police suspect the two brothers stabbed and killed their parents and siblings to death. Their 13-year-old sister survived the attack and anther sibling, their 2-year-old sister, was unharmed.
Psychiatrist Eric Vanderlip said without more information about their history, there are more questions than answers about such an act of violence.
"Something must have been happening, something must have been going on to prompt this, but the motive could have been any number of things and it is way too early to tell what possibly could have motivated something like this,' he said.
Vanderlip said there's no way to gauge if a teen is about to commit a violent act, however, there are a few red flags.
He said something serious is happening with them if they show sudden changes in behavior, withdrawal from things they enjoy, also being more irritable or even secretive and, last of all, a general feeling of being out of touch.
While detectives investigate, mental health experts, like Mike Brose, say the focus should be on supporting the 13-year-old girl who survived and is in the hospital, as well as her 2-year-old sister.
"It's going to be a long road and we can only hope and pray for the very best,” he said.
Vanderlip said, "Trauma is in the eye of the beholder, and especially kids can be remarkably resilient, they can overcome amazing adverse experiences.”
Both also said it's natural for everyone to feel a sense of shock, whether they were close to the situation or not.
They advise limiting children’s exposure to the media coverage of the tragedy and said if parents have teenagers, they should openly talk with them and reassure them they are in a loving environment.