A convicted felon was charged Wednesday in the deadly shooting of Chicago Police Officer Enrique Martinez , 26, during a traffic stop Monday on the South Side.

Darion McMillian, 23, faces felony charges of first-degree murder, Police Supt. Larry Snelling announced Wednesday.

McMillian also faces felony counts of attempted murder of a police officer, burglary, possession of a machine gun and possession of a gun as a felon, Snelling said.

McMillian allegedly opened fire when officers attempted to stop the vehicle carrying him, a second suspect and another man who was killed in the incident, the Sun-Times reports. At least one officer fired back, Snelling has said.

McMillian had been placed on electronic monitoring in Will County, Illinois. But earlier this week, Snelling said the tracking device had been cut off and police were investigating.

The Will County sheriff’s office issued a warrant for McMillian’s arrest last month, and he was charged with a felony for allegedly trying to foil a drug test, according to court records. At the time, McMillian was already facing felony cannabis charges.

McMillian previously pleaded guilty to a felony charge of shooting into a vehicle in May 2021, court records show.

While he was being held in jail in that case, he was hit with additional felony charges stemming from a group attack on another inmate. He pleaded guilty to a battery charge that was reduced from a felony to a misdemeanor on the same day as his other plea deal.