Police: Teens accused in grisly killings planned more murders

New chilling details seem to indicate that the Gwinnett teen accused of killing her grandparents had far darker plans.

GWINNETT COUNTY, Ga. -- Two teenagers charged in the grisly killings of an elderly couple planned more murders, police said.

Cassandra Bjorge, 17, and her 19-year-old boyfriend Johnny Rider have been charged with murder and aggravated assault in the deaths of Randall and Wendy Bjorge, both 63 years old. The victims -- Cassandra's grandparents --  were found with their throats slit on April 8. Police believe they had been dead for about a week before their bodies were found.

In a preliminary court hearing on Wednesday, police said that Cassandra Bjorge (who goes by Cassie) confessed to stabbing her grandparents.  Authorities also said she and her boyfriend smoked pot and partied in the house the week after the killing, caulking the doors and windows to conceal the smell of the bodies. 

"It's a pretty cold-blooded killing," said Gwinnett County Deputy Chief Assistant District Attorney Trason Cason. "It was planned. It was executed correctly, according to their plan." 

Police said that the teens saw the murders as just the beginning.

"Bjorge did indicate their plan was not only to kill the grandparents but also to kill Mr. Rider’s family and then ... their plan was to kill her mother and stepfather, but there wasn’t time," Cason said.

Rider had already been charged for allegedly beating his sister with a baseball bat and pepper spraying her at a different home the night of the murders. At the time, the teens were in possession of the Bjorges' car..

"They don't look like what you think a serial killer planned to like, but that's what they planned to be," Cason said. 

Bjorge and Rider were officially charged with the murders when they were released from the hospital after what police believed to be a suicide attempt.. 

RELATED | Mom of teen accused of killing grandparents speaks out

Police have called this a "very unique and disturbing case on so many levels," and said they may not ever find a scenario that makes sense to a "reasonable person."

According to police records, Cassandra Bjorge had previous run-ins with violent behavior. When she was 16, she was charged with assaulting her grandmother. Police had also been called to the residence several times in the past after the teen ran away.

Cassandra Bjorge isn't eligible for the death penalty due to her young age. The DA's office could seek the death penalty against Rider, but  no decision has been made.

Both remain jailed without bond.

TIMELINE | Teens accused of killing Gwinnett grandparents

PHOTOS: Bodies found in Gwinnett apartment complex

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