A mother, father and their 6-year-old son were returning from a trip to Disneyland when, according to the survivors' family, a man in a pickup truck turned a corner, smashed into their car and sped off.
The suspect, Constantino Banda-Acosta, was a man that border agents say had been deported 15 times over the span of 15 years.
In a statement provided to CNN, ICE confirmed that Banda-Acosta "has been repatriated to Mexico at least 15 times since 2002, most recently in January 2017."
He -- and another man arrested in connection with the crash -- were both "Mexican nationals in the country illegally," the statement said.
ICE is planning to take Banda-Acosta into custody once he is released by the San Diego police, who arrested him. He was charged with DUI, hit-and-run and driving without a license.
The crash happened Saturday in San Ysidro. The family was a block away from its home when their car was struck by a truck that drove through a stop sign.
The back seat on the driver's side took the brunt of the impact, CNN affiliate KGTV reported.
That's where the couple's 6-year-old son, Lennox, was sitting.
Lennox was taken Rady Children's Hospital with serious head injuries. A representative from the hospital said the boy is listed in "serious condition."
San Ysidro, the area in San Diego where the crash occurred, is about as close as one can get to the US-Mexico border. In fact, the neighborhood goes right up to the border in some places, and even its northernmost reaches are about two miles away from it.