DAYTON, TN (WRCB)- Channel 3 is learning more about the car accident that took three people's lives in Rhea County.

It happened on Back Valley Road in Dayton Sunday afternoon.

Investigators with the Tennessee Highway Patrol say 23-year-old Michael Crawley, his 17-year-old half brother Christopher Johnson and 3-year-old son Logan Crawley died in the crash.

Crawley's 8-month-old son Caydan was the only survivor, and was released from the hospital Monday.

"I just keep seeing it over and over," Mary Minton says. "All I see in my head is that guy laying on the passenger side and I knew he was dead when I saw him."

The Crawley's neighbor, Mary Minton, drove up on the scene just minutes after the crash with her 5-year-old daughter who was friends with little Logan.

"It keeps going through my head, you never know when your last day will be here," Minton says.

Crash investigators say Michael Crawley was speeding, lost control and drove into a 3,000 pound mailbox, sending it across the driveway. Now, the mailbox is the only thing back to normal.

Officers say everyone in the car was buckled up except the driver, Michael Crawley, but they say with this kind of impact, it wouldn't have made a difference.

Another driver saw the whole thing happen in his rear view mirror and pulled 8-month-old Caydan from the car.

He was released from the hospital Monday and is back home with his mom, Nichole Sink Crawley.

On Facebook she writes, "Caydan is going to be ok but please keep us in your prayers. We lost our family and I'm dying inside." Yesterday she wrote "I'm lost and don't know what to do."

"They were just devastated," Rhea County Chief Deputy John Argo says. "They were trying to comprehend losing people they love, and that many at one time is about more than they can handle."

Argo says it's always tough working fatal accidents, but this one was especially hard to see.

"It really got to me," he says. "It got to all of us. All the rescue squad and everybody. It's hard to deal with."

As mom, Nichole Sink Crawley asks for prayers, neighbors say they're pouring them out.

"I know it's hard for them to go through," neighbor Rhonda Wallace says. "I would be devastated if it was my own."

The accident report lists speed as the main factor.

The driver is being tested to see if drugs or alcohol were in his system at the time.

The funeral homes in town say services haven't been planned because the victims are still at the medical examiner's office.