Rojas was reportedly a Navy veteran with a history of driving under influence (DUI) arrests. The driver has previously been charged with and arrested for menacing and criminal possession of a weapon for threatening a man.
The New York Times reported that the driver was under the influence of drugs when he rammed into pedestrians in the city's most crowded and high-profile area.
During investigations, Rojas reportedly made statements that suggested that he was trying to provoke the police into killing him.
18-year-old Alyssa Elsman was killed in the incident while her 13-year-old sister was one of those injured.