The semi-truck hit about 28 cars and trucks on Interstate 70 near Denver on Thursday, killing at least four people and injuring several others, police said.
The 23-year-old Aguilera-Mederos is being held in four cases in connection with the vehicle crash. He appeared in court on Saturday and a judge ordered his bond to be $ 400,000. Until the results of the investigation, no formal charges have yet been filed.
Investigators say Aguilera-Mederos told them he would drive at 85 mph when the brakes failed. He tried to hug his shoulder to avoid the stopped traffic, but another Semi had stopped there, according to an affidavit.
"Rogel said he thought he was going to die, so he closed his eyes before he came across the stopped traffic," reads the document.
A witness told the police that he had noticed before the crash that something was wrong when he saw that Aguilera-Mederos saw "with big eyes" and "with a frightened expression", according to the affidavit Statement.
Following Saturday's hearing, Robert Corry, a lawyer representing Aguilera-Mederos, said his client was in "deep mourning" and cooperated with the police.
"It can not be overstated to what extent he worries about this absolutely tragic accident," Corry said. "Everyone agrees that it was an accident, law enforcement agencies agree that it was an accident, anyone who has investigated or looked at it believes it was an accident and it is tragic."
The authorities said that there were no signs of drugs or drugs giving up alcohol in the crash.
Ty Countryman, representative of the Lakewood Police Department, said the investigators would investigate if there were any mechanical problems with the truck, but believed that the killing of vehicles for manslaughter would still continue if a mechanical problem was confirmed. Aguilera-Mederos holds a business license from Texas. The brother of the suspect, Daniel Aguilera, said Rogel was Cuban and a permanent resident of the United States.
& # 39; scared and shocked & # 39;
People crawled out of the vehicles and pulled out those who were trapped as flames surrounded the wreck, surrounded by piles of wood.
Four people died while trapped in their vehicles, and their remains were unrecognizable, court documents said. Authorities have not published their names.
Josh McCutcheon, who recorded the crash on video, told the CNN sister network HLN that he had never seen such devastation. He's fine now, he said, but he was "startled and shocked" when he saw the deadly pile, the explosions, and the smoke.
"Oh, my God!" He shouted as it happened.  McCutcheon praised a "good Samaritan" for pulling people out of cars.
"This is a true hero," he said of the man who had been panhandling in the area.
"It just burned, I dropped my shield and took it away," Barton said. "As soon as I saw flames, I went under the bridge and took three or four people out of a few cars."
It's not clear what the vehicles ignited, Countryman said, adding that he did not know what he had in the field other than the one that seemed to be carrying wood.
"This seems to be one of the worst accidents we've had here in Lakewood," he said.
The Denver West Parkway Bridge over I-70 suffered significant structural damage from the fire, authorities said.
Lakewood is approximately 16 km from Denver.