'Unsafe speed' cause for Paul Walker's deadly car crash

The Los Angeles County Sheriff affirmed Tuesday that speed killed the "Fast & Furious" star Paul Walker in the fiery car crash last year.

"Investigators determined the cause of the fatal solo-vehicle collision was unsafe speed for the roadway conditions," Los Angeles County Sheriff's Commander Mike Parker said in a statement.

The high-performance Porsche Carrera GT sports car driven by Walker's friend Roger Rodas, 38, was traveling at speeds of 80 to 93 miles per hour. It was too fast for the 45 mph speed limit on the Santa Clarita, Calif., office park road, where Rodas lost control of the car and crashed into trees and a utility pole.

Walker, 40, died from traumatic injuries and burns while Rodas died of multiple traumatic injuries Nov. 30, according to the coroner's report, Reuters said. The investigation squashes any lingering suspicions that factors other than speed contributed to the crash.

Officials recently concluded that the two had no drugs in their system. Both men were wearing seat belts and the airbags deployed as they should have on impact. After consulting experts from Porsche and Michelin, investigators determined that there were no mechanical problems, and "no pre-existing conditions that would have caused this collision," according to CNN.

Another theory was that the crash was the result of a drag race, but that too was disproved.

"No eyewitness contacted the Los Angeles County Sheriff's Department to say there was a second vehicle and there is no evidence to indicate there was a second car involved in the collision," the report continued.

Walker, who was leaving a charity event with Rodas, died during the filming of "Fast & Furious 7," leading to the production being put on hold. Universal Pictures recently announced that filming would be completed using previously shot scenes with Walker, as well as CGI and body doubles. The seventh film in the franchise will be released April 10, 2015.