PIGEON FORGE (WATE) – The final autopsy reports for the victims of a Pigeon Forge helicopter crash were released Monday. The medical examiner states the pilot did not have alcohol or drugs in his system.

The sightseeing helicopter crashed on a ridge-line in Pigeon Forge in April. Five people died in the crash, including the pilot Jason Dahl, 38, passenger Johna Morvant, 49, and her two children, Parker Rasmussen, 18, and Peyton Rasmussen, 22. Peyton Rasmussen’s boyfriend Michael Mastalez, 21, also died.

Dahl’s body was found 20-feet away from the crash. The examiner says a video showed evidence of Dahl being alive after the crash. He later died at the scene due to thermal injuries.

He was not under the influence of alcohol and there was no evidence of drug abuse. The examiner claims no prescription medications were in his system. The toxicology report found caffeine in Dahl’s system.

The cause of death for passenger Peyton Rasmussen was respiratory problems caused by trauma and the fire, according to a medical examiner.

Parker Rasmussen and Mastalez both died because of the fire. Examiners used dental records to help with identification.

The medical examiner believes Morvant died because of blunt trauma to the head. The medical examiner believes thermal effects happened after death.

The National Transportation Safety Board says it could be up to a year before the investigation of the incident is finished.Related:First responders cope after Pigeon Forge helicopter accident

The Pigeon Forge Police Department released 9-1-1 calls of the incident. “A helicopter just went down and there’s black smoke everywhere,” said one caller.

The helicopter crashed near Rainbow Road and caught on fire while hitting the ground.

“I’m a firefighter, I’m going to see if I can do something,” one caller said. The dispatcher responded, “When you get there, if there’s any injuries can you give us a call back?” The caller answered, “There’s severe injuries right now, I’m looking at them.”