CHARLOTTE — The defense rested Thursday in the murder trial of Lavi Pham, whose former girlfriend, Mary Collins, was killed in Charlotte’s NoDa neighborhood. Closing arguments are scheduled for Friday, after which the jury is expected to begin deliberating. Prosecutor Jane Collins questioned Pham about autopsy photographs and challenged his account of the killing. Asked whether Kelly Lavery inflicted all the cuts and stab wounds shown in the images, Pham replied, “I didn’t hurt Mary.” Pham’s attorneys argued that he was voluntarily intoxicated and called pharmacologist and toxicologist Dr. Korin Leffler to explain how a combination of drugs could have affected him. Leffler testified that the drugs could have impaired Pham’s ability to understand the situation and weigh consequences. The defense has argued that intoxication helps explain Pham’s testimony that he stood by as Lavery and America Diehl initially beat Collins, and that he did not call 911. Pham also testified that he saw part of the killing and helped clean up afterward, according to testimony described in court coverage. Prosecutors played a recording of Pham’s police interrogation Thursday, highlighting differences between his statements to investigators and his later testimony. In the interrogation, he said Collins left his apartment for a photo shoot and James Salerno had already departed. On the witness stand, Pham described witnessing parts of Collins’ killing and helping with cleanup. Collins was 20. Her family described her as an art and photography enthusiast who lived with DiGeorge syndrome, a genetic disorder that limited her cognitive abilities, and had difficulty making friends. She and Pham had dated for two years before her death. The jury’s decision will determine whether prosecutors have proved Pham’s role in Collins’ killing beyond a reasonable doubt.