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Most people seem to have a poor understanding of rigor mortis. CW killed SW some time between 2:00 and, say, 4:00 or thereabouts. Her body was placed in his truck before 5:15.
Knight’s Forensic pathology:
The flaccid period immediately after death is variable, but commonly extends to between 3 and 6 hours before stiffening is first detected, depending on environmental temperature and other factors. Rigor is first apparent in the smaller muscle groups, not because it begins there, but because the smaller joints, such as the jaw, are more easily immobilized. The sequence of spread of rigor is also variable but tends to affect the jaw, facial muscles and neck before being obvious in the wrists and ankles, then the knees, elbows and hips.
In other words, her body was still flaccid when he put her in the truck and only then would rigor start and it would be in the smaller muscle groups.
I've also read that small children can be less affected by rigor.