GWINNETT COUNTY, Ga. — A teenager accused of killing her grandparents has been charged with murder.
Police were back at a Gwinnett County crime scene Monday looking over the house where two grandparents were found dead over the weekend.
As neighbors of Wendy and Randall Bjorge remember the slain couple, police are trying to figure out why their granddaughter Cassandra Bjorge, 17, and her 19-year-old boyfriend Johnny Rider would allegedly kill them.
Two detectives came back to the home on Furlong Run late Monday to look inside and outside for clues.
"We are exploring every option for motive in this case," Deon Washington told Channel 2's Tony Thomas.
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The Bjorge’s bodies were discovered Saturday after police were called to Rider’s sister’s home. Rider’s sister and her boyfriend said Rider and Bjorge attacked them.
Warrants say, “Rider grabbed Kevin and began striking him while yelling for his girlfriend to get a baseball bat.”
In another warrant, detectives told a judge that Bjorge hit the sister with the bat resulting with the victim "getting seven staples in her head and bruising on spine.”
“The assault scene was very violent,” Washington said.
Detectives now believe the teens killed the grandparents several days before.
An officer wrote, “We could see what appeared to be blood smeared on the wall and door frame to a back bathroom.”
The teens were hospitalized after police say they tried to kill themselves as a SWAT team surrounded them.
Police said Cassandra was a repeated runaway who had been living with her grandparents.
Both teenagers were released from the hospital and taken to jail within days of the alleged incident.
“They had (been) really the only people who really cared about her and was trying to help her,” neighbor Steve Lazzari told Thomas.