There was a documentary on that very subject:Lemme get this straight... From what she is saying...
The victim holds the door open.
Suspect doesn't say "thank you"
Victim gets mad.
Argument/Fight
Victim drags suspect in and out of store.
Suspect grabs knife.
Victim is killed...
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Sounds like two unhinged people. Did they know each other? This is crazy to die over an ego trip because someone didn't tell you thank you.