This undated photo, provided by the New York City Police Department on Monday March 4, 2013, shows Julio Acevedo, 44, who police are looking for in
This undated photo, provided by the New York City Police Department on Monday March 4, 2013, shows Julio Acevedo, 44, who police are looking for in connection with the death of an expectant couple that was killed in a car accident in Brooklyn early Sunday morning and their premature baby, who was delivered alive but did not survive. (Associated Press)

NEW YORK (AP) -- Authorities today are searching for a man with a history of violence and a prior drunken driving arrest suspected of barreling down a Brooklyn street and crashing into a pregnant woman and her husband, killing them and ultimately the child they were expecting.

Police identified the suspected driver as Julio Acevedo, and said he was speeding down the Brooklyn street in a BMW at 60 mph early Sunday when he collided with another car carrying Nachman and Raizy Glauber, both 21. They died Sunday, and their premature son died Monday.

Acevedo, 44, was arrested last month on a charge of driving while under the influence, and the case is pending. He served about a decade in prison in the 1990s for manslaughter after he was convicted of shooting Kelvin Martin, a Brooklyn criminal whose moniker "50 Cent" was the inspiration for rapper Curtis Jackson's current stage name. No one answered the door at Acevedo's last known address, in a public housing complex in Brooklyn. Neighbors said his mother lived in the same building, but she did not answer her door.

The couple belonged to a close-knit ultra-Orthodox Jewish community in Brooklyn, and members were in mourning. The child had been delivered by cesarean section after his parents were killed. The baby 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.