I respectfully disagree. I do not believe for one minute that - if he did kill GP - it was premeditated in any way.
He and GP were in a pressure cooker environment being confined to that tiny van, each gradually losing tolerance with the other for whatever reasons.
If GP got upset or stressed it appeared she would cry, lash out, smack and scratch (as documented in the police stop footage, and admitted by her and confirmed by BL and a separate witness to police).
If BL got upset he would try to distance himself from her, create space between them and reason with her. I believe on the police stop footage it was described by him as him saying for her to take a "time out".
Whilst we don't know if this was the pattern each and every time they had an argument, it does make me wonder what happened when BL was in a position where he couldn't physically create that distance from her, or there wasn't space for a time out. Where was his outlet for that anger and frustration?
If he'd been bottling it all this time throughout their roadtrip then it's an absolutely tenable premise that he did snap and retaliate.
There has been criticism on here of people using the word 'snapped' - almost as if it's being used to try and defend or justify BL's actions. It's not, at all, and if that is what happened and what caused BL to attack GP, then his actions are neither justified or excusable whatsoever.
I'm just trying to think of the WHYs this may have happened, because I do not believe he set out to kill her.
What would be the motive!?
MOO