A TEENAGER charged with stabbing his family to death with his younger brother laughed about killing his parents, detectives claim.

Robert Bever, 19, and brother Michael, 17, are charged with killing their parents, David Bever, 52, and April Bever, 44, in a night-time rampage.

They are also accused of killing siblings Daniel Bever, 12, Christopher Bever, seven, and Victoria Bever, five.

During a two-day hearing to determine if the brothers would stand trial on first-degree murder charges, detectives testified about hearing gruesome details of how they killed their family.

Detective Eric Bentz from the Broken Arrow Police Department said during the hearing that Robert Bever expressed a desire for notoriety for being a serial killer, The Sun reports.

He added that the teen was “laughing or chuckling on several occasions” as he described their plans.

Mr Bentz went on to say that the 19-year-old told of a plan to kill their family, cut up the bodies, and store them in bins in the attic.

He then planned to take the family vehicle — as well as guns and ammunition — to randomly attack other locations and kill 10 people in each place, Mr Bentz added.

Detective Rhianna Russell, who had interviewed Michael Bever, said: “They wanted to kill at least 50 people, they wanted to be famous. They wanted a Wikipedia page. They wanted media coverage.”

She said Michael Bever indicated that they wanted to outdo known killers, and had mentioned the Columbine High School shooting, where 12 students and one teacher were shot dead in 1999.

He is also said to have mentioned the 2012 Aurora movie theatre killings in Colorado, where James Eagan Holmes shot dead 12 people during a screening of The Dark Knight Rises.

Authorities had previously said the brothers plotted to kill their family and one had kept plans for a “mass homicide” on a computer drive — but they have not given details until now.

Both brothers have pleaded not guilty to the July killings of their parents and three siblings.

The family members were stabbed dozens of times and died of multiple, sharp-force injuries.

The autopsy report noted that dad David Bever had at least 28 total wounds and mum April Bever had at least 48.

Two siblings — including their then 13-year-old sister Crystal and their two-year-old sister Autumn — survived the rampage.

Crystal is expected to give evidence at some stage.

Mr Bentz testified that Robert Bever said the massacre hadn’t gone according to plan as “everyone didn’t die like they were supposed to”.

The brothers’ plans were foiled by their heroic younger brother Daniel, whose last act was to call police.

Police Sergeant Thomas Cooper said the 12-year-old reported that his brother was attacking the family before revealing the home’s location.

A struggle could be heard before the phone disconnected.

Mr Cooper said: “It’s fairly short, but it’s gruesome. Obviously the entire crime is gruesome, and the 911 call is just as bad.”

After the bodies were discovered at the family’s home in the Broken Arrow, Oklahoma, US, a police dog tracked the two teens — then 16 and 18 — in woodland behind the house.

Robert Bever is also said to have talked about a plan to make two videos — including one showing the gruesome aftermath of the attack.

Another version without showing the bodies was apparently to be posted online.

Cops seized items including knives, swords, machetes, mobile phones, gloves, computers, darts and a black mask from the home.

According to neighbours, the Bevers kept to themselves and their parents didn’t socialise much.

A judge previously rejected Michael Bever’s request to be tried as a juvenile and prosecutors haven’t decided whether to seek the death penalty against Robert Bever.

The hearing is expected to last two days.

This article originally appeared in The Sun and was reproduced with permission.