Manhattan prosecutors are expected to say Wednesday whether Angel Alvarez has been indicted in the Aug. 8 mayhem.
Alvarez was shot at least 15 times and denies firing at officers. Police have said officers fired after the 24-year-old shot at them. A man Alvarez was fighting was killed. Two officers and three bystanders were hurt.
The grand jury's work also could result in an expansive view of what happened and who was responsible.
Prosecutors declined to comment Tuesday. Alvarez' lawyers say they're confident grand jurors will conclude he shouldn't be indicted.