SAN JOSE, Calif. -- The driver of a Ford Bronco that fatally struck a 12-year-old girl as she rode her bike home from her last day of school before summer vacation is in this country illegally, San Jose officials confirmed on Friday.

Joe Castro, the man who has helped raised Breanna Slaughter-Eck, said he was very concerned about the revelation.

"I'm worried that she just might flee now and walk away from all this," he told the San Jose Mercury News.

However, San Jose Police Chief Rob Davis says that his department has alerted federal immigration authorities about the case.

The Santa Clara County District Attorney's Office has yet to decide if Adriana Fierro de Marin, 31 should be charged with felony vehicular manslaughter. She has been charged with driving without a license, a misdemeanor.

Slaughter-Eck was struck by a blue and gray Ford Bronco right off of busy Park Avenue about a block from her school in the city's Rose Garden neighborhood. Fierro de Marin was making a left turn onto Selborn Place when she hit and killed the girl.

Kelly Wierema arrived home from work to find the accident scene in front of her home.

"There was a chunk of hair from her a couple of feet from the car. They had to tape that down for evidence," said a grim Wierema. "I saw the car with the bike underneath it. There were two ladies sitting on the curb over there sobbing uncontrollably the whole time. I think they were drivers of the car."

Police say there is no evidence that drugs or alcohol were a factor in the accident. As standard procedure, investigators say any decision to cite or charge the driver won't come until the investigation is completed.

Neighbors say for years, they've tried unsuccessfully to get the city to install some sort of traffic control along busy Park Avenue. It's a major thoroughfare where drivers tend to speed.

"They drive so quickly. Everybody's in a hurry to pick up their kids or get to work. I know how it is, but you have to pay attention," said neighbor Lisa Garvey.

Residents say they'd like to see no left turns allowed to keep drivers from making the same left turn the driver made when she struck the girl.

"I'm just very sorry for the family. This has to be the very worst day of their lives. I just can't imagine," said Garvey.