TULSA, Okla. (AP) - The second-degree manslaughter trial of a former Oklahoma volunteer deputy charged with killing an unarmed man is set for closing arguments and jury deliberations.

Prosecutors and the defense wrapped up their cases Tuesday in the trial of Robert Bates, who has pleaded not guilty to the charges in the April 2015 death of Eric Harris.

A trauma doctor testified for the defense that Harris died of a heart attack, not as a result blood loss or a collapsed lung due to the gunshot. Prosecutors responded with a doctor who said Harris lost too much blood from the gunshot to survive.

The trial is to go to the jury Wednesday following closing arguments.