A full year has passed since the fiery FedEx truck vs. tour bus crash on Interstate 5 in Orland.
The collision injured 39 people on board, leaving many with serious burns, and ultimately took 10 lives.
But Friday, the investigation into the horrific crash did come to a close.
After reconstructing the crash and analyzing every aspect, California Highway Patrol investigators determined it was not caused by environmental factors, roadway conditions or vehicle maintenance.
The CHP says the FedEx truck driver did not apply the brakes or make any evasive steering movements to avoid the crash.
They say an undetermined medical condition, driver fatigue or sleepiness may have contributed to the crash.
However there is no conclusive evidence showing why the truck drifted into oncoming traffic.
A conclusion, leaving many crash survivors with mixed emotions.