NEW YORK (CBSNewYork/AP) — Elected officials say prosecutors should charge a police officer who killed an unarmed man in a dark public housing stairwell in Brooklyn.

The New York City medical examiner’s office has ruled the death of 28-year-old Akai Gurley a homicide. The medical examiner said Gurley died from a single bullet to the torso.

“The manner of death in this case means that death resulted in whole or in part from the actions of another person or persons and not from natural causes such as disease,” the medical examiner said in a statement. “The classification does not imply any statement about intent or culpability.”

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The Brooklyn District Attorney’s civil rights unit is investigating the case. Gurley’s girlfriend, Melissa Butler, the only civilian witness in the case, told her account to prosecutors Monday morning, CBS2’s Janelle Burrell reported.

City Councilwoman Inez Barron and Assemblyman-elect Charles Barron also met Monday with officials in the Brooklyn district attorney’s office.

Afterward, Barron told reporters he thinks the shooting warrants a charge of criminally negligent homicide.

“There’s no reason for his gun to be out of his holster. This was not an accident, it was a crime. It was reckless endangerment, it was criminally negligent homicide,” Barron said. “I am not calling for peace and calm. I’m calling for us to rise up and for us to demand justice.”

Meanwhile, a memorial continues to grow for Gurley at the Pink Houses housing complex in East New York.

Police have said the fatal shooting Thursday night appears accidental. The Rev. Al Sharpton and others are calling for a full investigation into what happened.