Surveillance video did not capture the accident, but does show just how chaotic things were.
Police say two women, 22-year-old Erinn Phelan and her roomate 23-year-old Alma Guerrero, were crossing Flatbush Avenue at around 4:30 Sunday morning.
A car traveling northbound plowed into the ladies and kept on going.
Both suffered severe injuries and were transported to Kings County Hospital.
It's there that Phelan was declared brain dead.
Mayor Bloomberg released a statement saying, "When I spoke to Erinn's parents earlier today, I told them that as a father I can't begin to imagine what they are going through, but all of our prayers are with their dedicated and idealistic young daughter who's helping New York City answer President Obama's historic call to service."
Bloomberg visited with the family at the hospital on Sunday evening.
Anyone with information on the hit and run can call the NYPD's Crimestoppers tip line through 311 or by texting "TIP577" plus your message to "CRIMES" (274637). Outside the Five Boroughs, you can call 1-800-577-TIPS (8477). All information will be kept confidential.
Guerrero was listed in stable condition.
Detectives did track down the vehicle a few blocks away, it's a 1993 green Acura Legend.
The damage to the windshield and side view mirror is consistent with what happened.
But, by the time police found the car on Pacific Street, no one was inside the vehicle.
It's registered to this home in the Bronx where no one answered the door. The NYPD is asking for the public's assistance in locating 31-year-old Cindy Jasmin, the registered owner of the vehicle. Detectives are actively looking to speak with her and ask the public's assistance in locating her.
Neighbors and a woman who lived in the back of the house, said they knew nothing about the hit-and-run.
Officers at the 77 precinct are trying to figure out just who was driving the car and where that person is.