(CNN) -- John Lajeunesse said he was heading to the Renegade Mountain area to go four-wheeling, nothing out of the ordinary for a 16-year-old kid in rural Tennessee. 

How he and three other young people ended up shot dead inside a car on that same mountain is now a mystery before police and the small community of nearby Crossville. 

A passerby discovered the car with the four victims, including a young mother, parked along a country road near the Renegade Mountain community Thursday morning. 

Lajeunesse and a pair of 17-year-olds, Steven Presley and Dominic Davis, were the passengers. Rikki Jacobsen, a 22-year-old mother of a young boy, was in the driver's seat. 

Three of the victims were current or former students of the local school district. 

"It's something that reverberates through the entire community," said Donald Andrews, Cumberland County's school superintendent. "The loss of life is always tough, and especially (so) when it's young people." 

Only one man has been publicly linked to the killings: Jacob Allen Bennett. Authorities said he was identified fairly quickly into the investigation and taken into custody around midnight Thursday without incident on a parole violation in nearby Rhea County. 

Randy York, the district attorney general whose territory includes the crime scene, told reporters Friday that his office intends "in the very near future" to empanel a grand jury to consider charges against Bennett related to the four killings. 

"The citizens of Cumberland County and Crossville can rest assured that we have the person who committed the crimes in custody, that the community is safe," said Tennessee Bureau of Investigation Director Mark Gwyn. 
Who is he considering charges against?
empanel a grand jury to consider charges against Bennett related to the four killings. 