My mom didn't die of suicide, but there would have been similar issues after her death (turns out that ulcers and blood thinners don't mix well)...and I've always wondered who the heck cleaned up, and when, but I've never been brave enough to ask my stepdad.
They didn't have carpet anywhere, but still, someone would have had to come in...
I loved my mom beyond words or time...but my mind does wonder these very basic things sometimes.
So I understand you wondering it all, but I would just go on an assumption that this was not the first carpet change, that they haven't been living in a sickening situation, and that you are just missing some aspect of it all.
As for living somewhere...I lived in an apartment complex with outdoor stairways, and someone hanged himself off one of those...I could barely walk by that building for a year (had to drive by, refused to look). On the other hand, unless you're living on absolutely new construction on land that no creature has ever ever touched, you're living where someone might have died...so somewhere between those extremes I bet is where you would find most people.
And to close my post, my stepdad lived in the same townhouse (though he got rid of quite a bit of her personal stuff very fast (I have a story of going through pre-9/11 security with a big carryon bag full of her jewelry and having a security agent congratulate me on my inheritance, ugh)) until he remarried (just inside of 3 years from when she died) and moved to a different city. Didn't switch rooms (it would have happened in their master bath or bedroom), slept in the same bed, used the same bathroom, etc etc until he moved house...
I probably would have switched rooms at the very least.
Anyway, I hope you can put your mind at peace with this in some way. And yes that's terrifying how she sent two shots out her window, when your house is in the sightline.
