Two sisters and a teenage son moved to a Colorado campsite last July, living off canned food. They had wanted to take a break from a world that distressed them, a local coroner said.
The fact that a hiker found one and the other two weren't found until the next day makes me think that one left to try and get help, froze to death, and the other 2 died waiting.
Apparently this was during winter. If they got hit by bad weather unprepared, they might not have had any options left once they realized they were fucked.