CHICAGO — Closing arguments are set to begin Thursday morning in the trial of Jason Van Dyke, the Chicago police officer charged with murdering Laquan McDonald.

Defense attorneys rested their case Wednesday. Prosecutors then called one rebuttal witness at the Leighton Criminal Court Building, 2650 S. California Ave.

Returning to the stand was Adam Murphy, a Cook County sheriff’s officer who previously said on Sept. 18 that he responded to 41st Street and Pulaski Road shortly after McDonald was shot there 16 times on Oct. 20, 2014.

Murphy previously said McDonald was “gasping for air and gurgling.” Murphy said he put on blue plastic gloves to render aid, but soon heard an ambulance in the distance.

On Wednesday, Murphy testified that McDonald was in a large pool of blood and still bleeding. A forensic expert for the state previously testified that McDonald bled profusely and each of his 16 gunshot wounds “accelerated” his death. Defense experts said only one gunshot wound to McDonald’s chest was “rapidly fatal” and would’ve killed McDonald quickly.

Murphy testified that no Chicago police officers on the scene rendered aid.

During cross-examination, defense attorney Dan Herbert told Murphy it’s CPD policy not to perform CPR since officers aren’t doctors. Murphy said, “I do not know their policy.”

Van Dyke, 40, took the stand Tuesday to say he only shot McDonald after the teen refused to drop his knife and continued to advance at the officer. Van Dyke’s testimony contradicts previous eyewitnesses, who said McDonald was walking away from police when Van Dyke opened fire.

Van Dyke is charged with first-degree murder, official misconduct and aggravated battery.