Police, though, said there were no reports of shots fired in the area around that time.
The fatal crash occurred just after midnight Saturday, when Raizy Glauber, who was seven months pregnant, decided to go to the hospital because she was feeling unwell, her family said. The Glaubers called a livery cab, a hired car arranged via telephone, not hailed off the street like a yellow cab.
The crash with the BMW reduced the livery cab to a crumpled heap, and Raizy Glauber was thrown from it. The driver of the cab was knocked unconscious.
The Glaubers were from Brooklyn, home to the largest community of ultra-Orthodox Jews outside Israel, more than 250,000, and were members of the Satmar Hasidic sect. Raizy Glauber grew up in a prominent rabbinical family. Nachman Glauber, whose family founded a line of clothing for Orthodox Jews, was studying at a rabbinical college.
The couple's son weighed only about 4 pounds when he was delivered, neighbors and friends said. He died of extreme prematurity, the city medical examiner's office said.
He was buried near his parents' graves, a community spokesman said. About a thousand people turned out for the couple's funeral a day earlier.
Community members hoped Acevedo would face murder charges, spokesman Isaac Abraham said.
"We in the community hope that today is Acevedo's last day that he sees daylight for the rest of his life," he said after Wednesday's arrest.
Acevedo was arrested last month on a charge of driving while under the influence, and the case is pending. He was stopped by police after they said he was driving erratically around 3 a.m. on Feb. 17. He had a blood-alcohol level of 0.13, over the limit of 0.08, police said.
He served about a decade in prison in the 1990s for manslaughter after he was convicted of shooting a Brooklyn criminal whose moniker, 50 Cent, was the inspiration for rapper Curtis Jackson's current stage name.
How Acevedo came to possess the BMW is under investigation. The registered owner was arrested Sunday on insurance fraud charges related to the vehicle, but the case was deferred.