Truck driver faces charges in Colorado crash that killed 4

The 23-year-old truck driver accused of causing a fiery interstate pileup that killed four people in Colorado last week has been formally charged with four counts of vehicular homicide

GOLDEN, Colo. -- Prosecutors on Friday filed 40 charges, including four counts of vehicular homicide, against a 23-year-old truck driver accused of causing a fiery pileup that killed four people last week on a Colorado highway.

Rogel Lazaro Aguilera-Mederos of Houston was "operating the vehicle under circumstances where he was exhibiting extreme indifference to the value of human life," said Jefferson County District Attorney Pete Weir.

Aguilera-Mederos' lawyer, Robert Corry, called the charges are "excessive, duplicative and prosecutorial overkill."

The crash happened April 25 on Interstate 70 just after it descends from mountains west of Denver. The pileup involved 28 vehicles and multiple explosions. Aguilera-Mederos told investigators the brakes on his semitrailer failed.

The truck was traveling at a speed of least 85 mph (137 kph) in an area where commercial vehicles are limited to 45 mph (72 kph), police have said.

Police also said that just before the crash the truck traveled past a ramp to the side of the highway that is designed to safely stop trucks and other vehicles that have lost their brakes.

The speeding truck had a "free and unobstructed path" to the ramp but instead swerved away from it, police have said.

The semitrailer was destroyed in the crash, making a mechanical inspection of it impossible, but investigators were trying to determine whether there might be other ways to determine if the brakes were functioning, Weir said.

Aguilera-Mederos was advised of the charges during a video court appearance Friday from the Jefferson County jail, where he remained in custody on $400,000 bond.

The charges against Aguilera-Mederos also include six counts of first-degree assault and 24 counts of attempted first-degree assault. Of the 40 charges, 36 are felonies, Weir said.