Opening arguments are scheduled to begin on Monday in the trial of a New York City police officer who shot and killed a motorist in a traffic dispute as he headed home from work last year in Brooklyn.

Wayne Isaacs is the first police officer in the state to be tried under an executive order that gave the attorney general the power to investigate and prosecute officers for civilian deaths at their hands or in their custody.

Officer Isaacs, 38, is charged with second-degree murder and manslaughter in the death of Delrawn Small, 37, during a confrontation on July 4, 2016, in the Cypress Hills neighborhood. His trial is in State Supreme Court in Brooklyn.

Last year, the police released grainy surveillance video of the shooting that shows Mr. Small getting out of his car and approaching the driver’s side of Officer Isaacs’s vehicle at a red light on Atlantic Avenue at the Bradford Street stoplight. Mr. Small quickly recoils and stumbles to the ground, as his girlfriend and two of their children, a 5-month-old boy and a 14-year-old girl, wait inside his car.