Cameron Sharp, 17, died in an accident on Andersonville highway in Norris shortly after 4 p.m. Monday.
The driver, Evan Weaver, 18, was flown to UT Medical Center for treatment of a fractured pelvis.
Weaver's grandfather says the last 24 hours have been an emotional struggle for the family.
"It's bad, it's bad. They're trying to hold up the best they can," said an emotional Earl Weaver.
Evan Weaver's grandfather says he has barely slept since he heard the news of his grandson's accident.
"I raised him. I practically raised him and his brother, sent them to school, took them to school," he said, choking back tears.
According to Norris Police Chief Danny Humphrey, Evan Weaver was driving on Highway 61 when he lost control of the vehicle, crossed over a concrete island and struck another car.
Weaver's best friend, Cameron Sharp, died at the scene.
"I want everyone to pray for the one that didn't make it. It's his best friend he had," Weaver said.
Police say they don't think Sharp was wearing his seatbelt and they are still trying to determine whether Weaver was.
Earl Weaver said when he saw the crash he didn't think either of the teens would survive.
"I believe he'll be alright, I didn't think there was a chance for either of them when I saw the car," he said.
The investigation continues as Norris police and Tennessee Highway Patrol troopers work to reconstruct the accident.
For now, friends and family of the two teens are trying to cope.
Students gathered Tuesday morning at Anderson County High School for a prayer vigil.
On Evan Weaver's Facebook page, he wrote, "I'll be alright physically, just a fractured pelvis. Now emotionally, that's a different story. I love you like a brother Cameron."
Weaver's grandfather says all he can do is pray.
"I pray that everything will be alright, I pray myself to sleep every night," Weaver said.
Police have requested a drug and alcohol test, as standard in accidents like this, but it could take months before results are known.
As for the other vehicle involved in the crash, the driver and passenger were employees for A and A Glass Company on their way back from a job. The driver was uninjured, the passenger received several stitches.
Anderson County District Attorney David Clark said his office will wait for the police investigation to conclude before discussing the possibility of filing any charges.