Teen Found Near Boston Likely Fell From Plane : NPR

Looks like a stowaway on a commercial flight, climbing into the gear well, that wasn't detected.

From what I can infer from the article it appears he was "released" when the plane was landing. Thus, he probably didn't think or know about pressurization issues, successfully made takeoff, lost consciousness and died, then fell to earth when the well opened during approach.

I'm surprised the pathologist couldn't make this determination pretty quickly, but thinking about it I'm not sure it would look too much different from somebody who died from other causes then had his body "mutilated" by blunt force trauma after death.

R.I.P., sounds like a tortured soul to try to run away in such a fashion.