Scraper reportedly slipped first and the two men were also swept away trying to save her. "There are truly no words that can be said to ease the pain and the devastation we are all going through right now", said one of the members.
Last year, Gamble, Lyakh and another group member were banned from USA federal land for five years after pleading guilty to walking on a sensitive hot spring in Yellowstone National Park and other crimes at parks across the west of America.
A GoFundMe page has also been created by the group to help pay for a memorial "to commemorate the handsome lives and legacies that these 3 friends left behind".
According to Facebook, Gamble, Lyakh, and Heuser were 'friends since high school and have been making videos ever since'.
In 2016, two out of the three adventurers, Gamble and Lyakh, were forced to apologise after they walked on a sensitive hot spring in Yellowstone National Park.
Cpl Sascha Banks said they fell almost 100 feet. Members of the group travel to exotic locales and, at times, vault guardrails and ignore warning signs as they dive from cliffs and swing through canyons - always with cameras recording for YouTube and Instagram followers.
The High on Life team uploaded a video Friday to commemorate Gamble, Lyakh and Scraper, and to encourage people to share inspirational messages using the hashtag #HOLInspired.
Ryker's girlfriend Alissa Hansen has expressed her grief on Instagram with a heartbreaking poem and a collection of photos of the pair.
"In an attempt to get the ideal shot, we acted in a way that doesn't reflect our respect for the environment we were trying to capture", they said. Gamble, 30, had more than 71,500 followers on Instgram. Scraper said it was a life most people can only dream of. But others said the exploits were pointless and unsafe vanity, putting their young lives at risk for bragging rights and YouTube views.