We just had a frightening situation here in my hometown last Thursday. A crackhead got high, walked over to his neighbor's house, and knocked on the door. When she answered it, he pulled out a .357 and shot her multiple times, killing her instantly. He then walked into her kitchen, used her phone to call 911, and told the dispatcher what he'd just done.
The victim was a nurse's assistant at the local hospital and had just moved into the house a few weeks ago. So far as anyone can tell, she'd never met her killer.