The pair became disorientated and lost the trail, and were forced to spend the night in the wilderness.
The following morning, Jaxson's mom made the decision to seek help on her own because the boy was too tired.
"They spent the night together," the dispatch stated, according to the Ketchikan Daily News. "In the morning, Treat left Jaxson to seek help on her own, as he was reportedly tired and didn't want to hike anymore.
"In her rush to find help, Treat reportedly tripped on a root and significantly injured her leg."
The search didn't begin until 10.30am Friday morning when state troopers were alerted that the pair were missing. They found Treat's car parked at the trail head. Treat herself was found about three miles up the trail, where she told rescuers she had left her son behind. She was airlifted to hospital by helicopter.
Members of the Ketchikan Volunteer Rescue Squad, Alaska State Troopers, Alaska Wildlife Troopers, US Forest Service Law Enforcement, and North Tongass Volunteer Fire Department all assisted in the search, but all they could find was a single shoe belonging to the boy.
A Coast Guard helicopter even joined the search overnight using infrared systems to scan the area, but came up empty-handed.
Conditions on the trail ranged from improved areas and boardwalks to areas that are "really heavy with blow down, and muddy and hard to traverse," said Jerry Kiffer, Ketchikan Volunteer Rescue Squad incident commander. "You've kind of got the gamut all the way up to the lake." Some areas were dry, he said, while others had waist-deep snow.
According to Trooper Sgt. Grant Miller, while the boy had been on the trail before, "we are not certain how far up the trail he's been. He has never been by himself.”
It wasn't until 2:45 p.m. on Saturday that Jaxson's body was found, around 1,000ft from the trail, and further up from where his mother was rescued.
An autopsy will determine the cause of death; the weather -- with rain, mist and fog, and overnight temperatures plummeting to mid 30s during the time he was missing -- may have been a factor.