Yes, natural gas that is pumped into your home has an added rotten egg smell you can't miss. Carbon Monoxide (CO) doesn't have any odor of it's own, so it is a much more sneaky killer.
My first guess on this is either CO poisoning (it's been fairly cold at night in New Mexico the last few days--faulty heating appliance?), or, secondarily, a murder/suicide.
Some years ago, had an odd experience with the gas company emergency line.
First time I called with my concerns they said it couldn’t be gas because I didn’t smell it.
I called back and said there was a smell, and was told the CO wouldn’t smell.
I actually forget the order of the calls, but sometimes they like to make you feel it’s a game in which you have to compete to get a response.
Same thing just happened with my oral surgeon, the nurse tried several times to get to the conclusion that I didn’t really need to see him for pain and swelling in the area where he just removed a wisdom tooth.
Then when you get past the gatekeepers, you’re treated completely different.