The L.A. County Sheriff’s Department completed their investigation into the cause of the fiery car crash that killed Paul Walker and his friend Roger Rodas.

Paul Walker: Sheriff’s Office Reveals Cause of Deadly Crash
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Authorities say excessive speed and old tires were to blame.

Surveillance videos and data from the 2005 Porsche Carrera GT that Rodas was driving indicate that the car was traveling at 93 MPH in a 45 MPH zone.

Paul Walker: Horrific New Details Revealed in Final Coroner's Report 

Investigators also believe that the car’s nine-year-old tires -- not a mechanical error -- also played a role in the November 30th 2013 crash.

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