I think that I have mentioned a couple of times here that I have some experience handling reptiles.
The first mistake that was made was actually keeping a rock python. I've worked at a few different places that sold snakes, none of them sold rock pythons.
These snakes are unusually aggressive and while I would ordinarily agree with TD in regards to snakes only killing what they would eat, experience tells me that there are certain reptiles that do not fall into that mold.
This was a big snake, 100 pounds. when a snake this big and this aggressive gets hungry enough (actually we don't know how well the snake was cared for) to start hunting it's sorta like going shopping for groceries on an empty stomach.
As Iv'e mentioned before I got wrapped up by an 11 ft burmese, half the weight of the rock python, and they are surprisingly strong. The thing that I find unusual is that when the first kid got wrapped up the second kid didn't wake up and run like hell but the fact is that if the snake got two coils on the first kid and squeezed then the first kid wasn't going to do anything other then die. No yelling because their was no air in the first kids lungs.
Anyway, the autopsies should be fairly straight forward. A couple of the dead giveaways for a python attack are teeth left behind in the bite wounds and excessive bleeding, also from the bite wounds.
On edit: I forgot to mention to you folkes that live in southern florida, you have african rock pythons that live among you...sweet dreams.