CHICAGO – A 23-year-old man has been charged with first-degree murder in the fatal shooting of a Chicago police officer during a traffic stop on the city’s South Side.

The man is scheduled to appear in court Thursday and also faces separate charges of first-degree murder, attempted murder of a police officer, residential burglary and weapons violations, Police Commissioner Larry Snelling said Wednesday reporters.

Officer Enrique Martinez was shot Monday around 8 p.m. after he and other officers conducted a traffic stop on a vehicle that was blocking traffic. While Martinez and his partner were talking to the driver, a man in the front passenger seat was seen laying a bag on the floor, said Chief of Detectives Antoinette Ursitti.

Officers ordered him to stop, but the man pulled a gun — equipped with a machine gun conversion device and an extended magazine — and fired at Martinez, striking the officer and the driver, Ursitti said.

The man then pushed the driver out of the vehicle and drove off, dragging another officer a short distance away. After crashing into a parked car, he ran into an apartment, grabbed a knife and cut a court-ordered electronic monitor. A woman inside the apartment was not injured.

He was caught shortly after fleeing the apartment.

Martinez was pronounced dead at a hospital. The driver of the vehicle also died.

Authorities said they later found the converted gun and another weapon. A third man who was in the backseat of the vehicle was also arrested but released after investigators determined he was not involved in the shooting, Ursitti said.

Ursitti said the suspected shooter was being released from prison as a condition of his prior arrest for attempting to cheat on a drug and alcohol test.

“This individual should not have been on our streets with a fully automatic weapon,” Snelling said, adding that handguns converted to fully automatic fire put officers at a disadvantage.

“Our officers were doing everything they could to prevent this from escalating into something else,” Snelling said. “Because of the weapon this individual had, our officers were outmatched. They turn these pistols into hand machine guns, and the possibility of killing a person becomes greater. The ability to shoot more people at once becomes much greater.”

Martinez, 26, was approaching his three-year anniversary with the police department.

“Officer Martinez was killed by the violence he was trying to stop,” Snelling continued. “We must be outraged by the proliferation of guns that are killing our residents, our children and our first responders.”

The Office of Civilian Police Accountability is investigating the shooting.