(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. 
How many people were killed?
How were they killed?
Where were they?
Does the mountain have a name?
What were they doing there?
Who is John Lajeunesse?
how old was he?
Who found them?
How many of the dead attended the same school?
How old is the mother?
Did she have adult children?
How old are Steven and Dominic?
And Lajeunesse?
Who appeared to have been the driver?
Where they found outside of the car?
Who is Randy York?
Who is he considering charges against?
When was Bennett arrested?
What did they arrest him for?
Where?
four
he and three other young people ended up shot dead
they were shot
How he and three other young people ended up shot dead 
on a mountain
How he and three other young people ended up shot dead inside a car on that same mountain
Renegade Mountain
he was heading to the Renegade Mountain area
four-wheeling
he was heading to the Renegade Mountain area to go four-wheeling
one of the dead
How he and three other young people ended up shot dead
16
 a 16-year-old kid in rural Tennessee. 
A passerby
A passerby discovered the car with the four victims
three
Three of the victims were current or former students of the local school district.
22
 a 22-year-old mother 
no
a 22-year-old mother of a young boy
17
 a pair of 17-year-olds, Steven Presley and Dominic Davis, 
16
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. 
Rikki Jacobsen
Rikki Jacobsen, a 22-year-old mother of a young boy, was in the driver's seat. 
no
How he and three other young people ended up shot dead inside a car
the district attorney general
Randy York, the district attorney general
Bennett
empanel a grand jury to consider charges against Bennett related to the four killings. 
Thursday
 Bennett. Authorities said he was identified fairly quickly into the investigation and taken into custody around midnight Thursday
a parole violation
taken into custody around midnight Thursday without incident on a parole violation
in Rhea County
 taken into custody around midnight Thursday without incident on a parole violation in nearby Rhea County. 