OF COURSE it was planned, that's why the accused was charged with FIRST degree murder. A first degree murder charge is laid when a homicide is both planned, and deliberate. Surely you don't think the accused decided to bury a knife in her because of a spur of the moment in-store argument.
I highly doubt he killed her because they couldn't decide what type of new car mats to buy...

Quin wrote:"Easier to get than a knife?  Doubt it.

You think this was planned?  Doubt that too."