You're right in terms of lack of heartbeat resulting in a lack of pumping blood. But blood in the veins (as opposed to arteries), particularly peripheral veins (just under the skin) can flow out if injured, for some time after death. It's darker blood, and will tend to pool or dribble, as opposed to the usual arterial "spurter" so well known by surgeons (!) and TV audiences
The amount of blood in the back of the Captiva was small, so could feasibly have come from a small tear in a peripheral vein or even the scalp, lip, a bang on the nose, eyebrow, chin, etc. This could quite feasibly have occurred after death - but very shortly after.
The fact that the blood in the car was only on the side and not in the middle could be due to EITHER the injury being of an extremity (foot or head), OR that the rest of the body was covered by something or was lying on something (eg a tarp).
But when all said and done, the amount of blood was really quite small. And as I have suggested on here before on a few occasions, and which was confirmed by the forensic scientist in the witness box today or yesterday, there is no way to "date" or "age" blood after that first hour or two, to say how long it's been there. That could be a flaw in the prosecution argument.
However, the hair, which appears to be stuck IN the blood, is another matter. And especially if it showed evidence of the hairdresser's the night before....
However, the hair, which appears to be stuck IN the blood, is another matter. And especially if it showed evidence of the hairdresser's the night before....
Smoking gun..... A single hair ....