The subject vehicle left roadway and impacted a tree in a pure frontal impact. The front seat passenger airbag failed to deploy. An 11 year old child was seated and properly belted in the front passenger seat. The child was killed as a result of blunt force trauma to his head when his head struck the front dash structure. In addition, the belted occupant seated behind the front passenger seat, while properly belted, impacted the rear of the front passenger seat and the seat deformed forward, limiting the ride down space for the front passenger seat occupant. The other three occupants in the subject Toyota Tacoma suffered non-life threatening injuries.