. >> you know, i grew up in new york city where there was the infamous case of kitty genovese. >> in4, kitty genovese, a 28-year-old woman, is stabbed outside her queens home, then later raped and stabbed again. nearly 40 people either see or hear the crime from their homes, but no one responds to her calls for help. >> that led to a lot of studies looking at what's called the bystander effect, which is when people see someone in trouble, we are far less likely to reach out and help if we see that other people are around because we assume that means, hey, the other guy has it handled, when, in fact, if everybody thinks that way, nobody helps. >> unfortunately, more than four decades after the genovese murder jose sanchez suffers the same awful fate. the ambulance rushes him to the hospital, but it's too late. sanchez dies of a traumatic brain injury three days later. >> is it possible that immediate medical care would have made a difference? we'll never know for sure, but it does seem like there is a possibility. >> hector gomez thinks the makeup of the population in this neighborhoo