It took roughly 3 weeks until the death of my neighbor was finally detected. Granted, it smelled a little odd to my rather non-functional nose, but the staircase of this house has smelled of weird a lot while we had this old lady with the bladder control issues. Long story short, his immediate neighbor finally called the police since the smell seeped into her apartment. Why did it take so long? He had aggression issues, and was basically kept sociable through a nice mixture of drugs. When he forgot to take them, he would randomly threaten other people from our house, sometimes with death, sometimes just screaming at them. He was a problem, to be honest. Younger women coming visit our apartment building sometimes left in fear, because he would randomly verbally attack them. I got a straigt death threat to my face. "I am going to kill you." Turns out, if you call the police, they tell you "And what am I supposed to do now?" Taught me a lot about "the system". Anyways, when he passed away, and didn't make any useless nose anymore, nobody cares. Social isolation is a complex mix of a lot of things. And its a feedback system...