Or being outdoors in the wrong situations. I know our minds often go to drugs in cases like this. See the link below regarding how hyperthermia and alcohol related deaths have been rising for as long as records have been kept (not always at the same rate, but generally rising). In 2001, there were just under 600 such deaths. Overall hypothermia deaths (preliminary data) in 2023 were over 1300 (with just over 50% of those involving alcohol. The age distribution (shown below) has been changing. Alcohol use was noted in more than 75% of hypothermia deaths among males in MO (and with only 20% of hypothermia deaths among females). The age distribution of the alcohol related deaths in MO was not the same as overall hypothermia deaths. Here's the graph:
https://health.mo.gov/living/healthcondiseases/hypothermia/pdf/hypo4.pdf (MO data only)
Hypothermia-Related Deaths --- United States, 2003. (contains data for all 50 states)
The graph below shows Missouri hypothermia deaths by age over a long period:
20 years ago, the last column (the oldest people) would have been higher. There are more deaths in the 30's and 40's (mostly all male) and slightly fewer in the over 80 group. Deaths among babies, children, teens and 20-somethings tend to be lower than 100 years ago.
In Missouri, hypothermia deaths are far more likely to happen in December and January:
So statistically, the three men are in an age group with great incidence of alcohol (or other substance) related hypothermia as the CoD.
I believe this will be ruled accidental. MO gives the public access to autopsy reports under most conditions (but not if it's a criminal investigation).
IMO.