Gwinnett County Police say a teenager and his girlfriend may be to blame for the death of the girlfriend's grandparents.

Police responded to an assault call off of Rambling Woods Drive in Lawrenceville Saturday night. There, two victims had been beaten by their family member, Johnny Rider, 19.

"Rider was in company with his 17-year-old girlfriend, Cassandra Bjorge," Det.  D.C. Smith said. "Due to the injuries, warrants were obtained for Rider."

While at the scene, officers located a vehicle belonging to 63-year-old Wendy and Randall Bjorge, the grandparents of Cassandra, police said.

According to authorities, officers had previously been to the home of Wendy and Randall earlier in the week for welfare checks and were unable to make contact. Because of the crime at hand, officers decided to again make a welfare check at their home.

"Officers were unable to make contact and made entry into the home," Det.  D.C. Smith said. "Wendy and Randall were found deceased in the upstairs area of their home. Their deaths were apparent homicides. The location of Cassandra Bjorge and Johnny Rider were still unknown."

Smith said detectives and crime scene personnel worked throughout the night and received information on Sunday morning leading them to the location of Cassandra Bjorge and Johnny Rider.

They were found in the 800 building at the Residences at McGinnis Ferry at 4000 McGinnis Ferry Road in Suwanee.

Officers said they attempted to make contact and the suspects refused to exit the apartment. The Gwinnett County SWAT team was activated.

After a short time, the SWAT team made entry into the home and located the suspects suffering from self-inflicted wounds. The suspects were transported to Gwinnett Medical Center for treatment. No officers were injured during the event.

Cassandra Bjorge and Johnny Rider are under investigation for the homicides of Wendy and Randal Bjorge.

No charges for the homicides have been obtained and the manner of death and motives are still unknown pending further investigation.

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