Similar case in Colorado 5 years ago: https://denver.cbslocal.com/2015/07/28/father-and-son-were-killed-by-carbon-monoxide-in-tent-not-lightning/ https://denve

Similar case in Colorado 5 years ago: https://denver.cbslocal.com/2015/07/28/father-and-son-were-killed-by-carbon-monoxide-in-tent-not-lightning/ https://denver.cbslocal.com/2015/07/28/father-and-son-were-k... Canister stoves that produce a small amount of carbon monoxide have an unfortunate feature of making more CO with increasing altitude. Watch out: a stove in a tent that was perfectly fine at 5K feet becomes a source of CO at 8K feet.