The Owyhee County Sheriff's Office says that Jacob Canoy was driving his SUV with girlfriend Sara Bronson, 21, and his two sons, ages nine and five, in the area of Hemingway Butte on March 26 when the SUV rolled off a ridge.
The sheriff's office says that all four people were thrown from the vehicle, and Bronson ended up being pinned underneath it. She died from her injuries.
Canoy called 911 immediately after the crash.
"I blew a tire and we went down a cliff side," Canoy said, startled and out of breath. "I have a 5-year-old and an 8-year-old and we're all very injured. My girlfriend's pinned underneath the truck and bleeding from the head."
The man had difficulty telling the 911 operator where they were.
"I can't. I am on the back side of the Owyhees. I can see...I don't know where I am."
The crash site's location made for a challenging rescue.
"It was very difficult," said Owyhee County Chief Deputy Lynn Bowman. "They were on the phone with a relative who was on the phone to our dispatch. They said they were about four and a half miles from the motorcycle parking area, but the road is only about two miles."
The vehicle wreckage was spotted by crews in the air ambulance. Officials told KBOI 2News the vehicle was driving in an area (near the Hemingway Butte trailhead) which is meant for dirt bikes and ATVs.
Deputies say Canoy suffered severe injuries and had to be flown to St. Alphonsus in Boise along with his older son. Canoy's younger son was taken by ground ambulance to St. Alphonsus as well.
The sheriff's office says Canoy has been charged with felony vehicular manslaughter and two counts of felony injury to a child, as well as citations for operating a motor vehicle off-road and for no one in the car wearing a seatbelt or being restrained in a child seat.