I have read the entirety of this so am not just jumping in but I have not commented before. It definitely seems there is more to this that is unknown to most of us. It does not change the murder victim was a victim and stuffed into a closet.
So we have a young perpetrator who hired a private attorney and yet seems to be someone who worked a job, was not in college, or anyone of any means, car, etc. The money must come from family? To hire a private attorney? Just speculating and also an observation based on other posts I have read in the number of pages here over several days.
I have other thoughts but they are such absolutely pure speculation that I will refrain. I do agree with others though generally in the question of what is the reason they work together, live not that far apart, shared a ride and one was with this gf and now another was that knew and worked and rode with the first bf? Many people's worlds are not that large...
What was the real reason... ?
I am not buying the jealousy angle as a main motive for some reason...
My opinion based on the bit known and subject to change

and jmo.