Compression asphyxia - thanks for that
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I've been running this through my head for a while, and have my own 'maybe' scenario. Really unpleasant thing to think through....
After the girls are in bed asleep, GBC goes for a hot soak before bed. Whilst he's in the tub, Allisons goes through his phone and finds a phone call to/from TM, from earlier in the day. Allison goes into the bathroom and confronts GBC. At some point GBC gets out of tub. An argument ensues and Allison (fed up) tells GBC she's going to tell TM about the other women (?) and about how deep a financial hole he's in. GBC grabs Allison and pushes her into the bath in an attempt to try and drown her, Allison starts kicking (loud splashing noises and sounds of struggle in bathroom), claws at GBC's torso to try and stop him. Allison inhales a small amount of bathwater and struggles harder, perhaps flailing her head and breaking her tooth causing her lip to bleed. GBC drags her out of the tub, then pushes her towards the bed whilst holding her in a sleeper hold to prevent her from screaming, he then throws her onto the bed face down, GBC puts his full body weight onto her upper back, making it impossible for Allison to exhale and thus draw fresh air, GBC maintains this until Allison is dead.
At this point he notices the blood and puts a bag over her head to limit the amount of blood spill.
Fast forward. While carrying Allisons body to the back of the car ( possibly with assistance) the bag snags and comes off, GBC and other person can't grab it as their hands are full, so places Allisons body in the back of the car, where GBC then re ties the bag on, in the process, getting blood from the bag on his hand (blood on outside of car and contact blood mark in car) perhaps a drop escapes the bag before he completes tying it back onto Allisons head.
IMO
JMO
MOO