I live in Washington and we've had our fair share of murders and tragedies lately. That said, the salaciousness of this story...not to mention Knox is a white girl from an upper-middle class family who attended UDub...resulted in coverage overload. The Seattle Times even employed a pseudo-journalist/"freelancer" in Italy to cover the trial; readers became so sick of the story that the Times actually turned off their "comments section," due to criticism of the Times for disproportionately covering Knox.
That said, if Knox were a high-school educated Hispanic, from a lower-middle class family and the murder took place in Tacoma, do you believe the coverage would have been the same? Unfortunately, I suspect more readers care about the ongoing Knox soap opera than they do the recent tragedy involving the Lakewood Police Department.
BTW: I think most educated, well-traveled people understand that Italy isn't a third world country; furthermore, they don't have anywhere near the levels of violent crime we have. In otherwords, their court system seems to work well. At every step in her story, Knox lied...she blamed innocent people, she gave conflicting stories and ultimately, she put herself in a position to fail. I really wish the local print media would just move on and concentrate on our bigger problems...