The truth is upon us wrote, "Would be interesting to know what the argument was about."
.
Lots of things don't pass the "sniff test" and would be interesting to know.  Who is the "witness" who managed to disarm Pisano, where is that gun?  Where is the living partner, Michael DuPree, and where was DuPree at the time of the shooting?  Why would a recently retired paratrooper with no criminal record throw everything under the bus after, I assume, 25 years of military service with retirement benefits?  
.
JMHO, anybody who calls for the death penalty in advance of a fair trial is UN-American and should renounce their citizenship tomorrow.