PHOENIX -- Trevor Crouse was supposed to start his sophomore year at Boulder Creek High School on Monday, but instead there will be an empty seat in his classes.
Crouse spent most of Friday battling for his life at Phoenix Children's Hospital after a rappelling accident at Camelback Mountain that morning. He succumbed to his injuries in the evening.
The 15-year-old went to Echo Canyon with two friends and his friend's father, a Phoenix firefighter and member of the department's technical rescue team.
The off-duty firefighter, Crouse and another teen were apparently rappelling down the Sugar Cube boulder near the trailhead when they fell more than 30 feet. Johnstone's son was watching the maneuver from nearby.
Johnstone died at Scottsdale Healthcare Osborn Medical Center on Friday. The other teen suffered minor injuries.
Police are investigating what led up to the fall.
Crouse was an athlete and Eagle Scout who loved the outdoors.
He ran track at his Anthem high school last year and was expected to do so again this year. He also had dreams of being in the military someday.
"He just loves helping people, helping inspire the younger scouts to do something with their lives, just using your time wisely," said fellow scout leader and childhood friend Joseph Poznecki. "He really embodied that because he accomplished so much in just a short amount of time."
Off-duty firefighter, teen boy killed while rappelling at Echo Canyon