Court documents say that a speeding semitruck passed a runaway truck ramp before plowing into other vehicles on a crowded highway near Denver, killing four people and injuring at least six others.
The truck driver, 23-year-old Rogel Lazaro Aguilera-Mederos, of Houston, made his first court appearance Saturday after being arrested on suspicion of vehicular homicide.
State District Judge Chris Zenisek set $400,000 bond. Aguilera-Mederos, who suffered minor injuries in the crash, didn't speak during the hearing. He was represented by Denver attorney Robert Corry, who couldn't be reached for comment afterward.
His next court hearing is set for May 3 when prosecutors are expected to file charges against Aguilera-Mederos, who remains in the Jefferson County jail.
The crash happened Thursday on Interstate 70 where the highway descends from the Rocky Mountains.