A whack job nutcase
who goes on a murderous rampage
for any number of reasons, including but not limited to mental instability, political/ideological disputes, delusional
government conspiracy theories, or personal socio-economic woes.
As defined by Pima County, AZ Sheriff Clarence Dupnik on msnbc.
That fuckin' whack-job Jared Loughner who shot AZ Congresswoman Gabby Giffords and 18 others is a prime example of a particularly troubled personality.