Police also learned that he is in the country illegally and that he has never had a driver's license.
Police say Romero was driving a Honda Accord southbound near the Liberty Street exit on US-52 when he slammed into the left side of the ambulance with so much force that it flipped on its side. The ambulance rolled over on its side and the Honda ran off the road.
A mother and baby's trip from the mountains in Virginia ended in Winston-Salem early Sunday morning.
An unlicensed illegal immigrant was "grossly impaired" when he crashed into an ambulance and killed a 3-year-old boy, court papers say. His mother received non-life-threatening injuries that were later treated at the hospital. The others are expected to be OK.
The ambulance was transporting mother Lyndsay Ann Oakes, 27, and her sick child from Wise, Virginia to an unidentified medical facility.
The driver has been charged with driving while intoxicated.
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Initially, Romero was placed under a $50,000 bond, but the bond was revoked and he was being held in the Forsyth County Jail Monday night with no bond allowed, the Forsyth County Sheriff's Office said.
Federal authorities also put Romero under an immigration detainer.
Immigration officials have issued a retainer on Romero, meaning he could be deported if he is released from local custody.
Newnum didn't have an exact age for the boy or further details on why he was being brought to the area before the crash happened. A witness described what Romero looked like to police after the crash.
Jose Duran Romero, 27, blew a 0.19 on a breathalyzer almost two hours after the crash, more than twice the legal limit, FOX8 Winston-Salem reported late Monday.
Two hours after the crash, Romero submitted to a breathalyzer and registered more than two times the legal limit of alcohol in his system.