A second man was charged with a fatal shooting inside a Portage Park neighborhood gas station over Memorial Day weekend on the Northwest Side.

Rasheed Mujkovic, 23, faces one count of first-degree murder, according to the Cook County state’s attorney’s office.

Mujkovic and his co-defendant, 24-year-old Florin Mulosmani, walked into a BP gas station in the 6300 block of West Montrose about 5:15 a.m. May 28, prosecutors said.

Damien Cionzynski, 23, was already inside the gas station with a friend making a purchase. Mulosmani got into an argument with Cionzynski’s friend and began patting down Cionzynski’s pants and demanding his belongings, prosecutors said.

Mulosmani then punched Cionzynski’s friend, and Cionzynski pushed Mulosmani away, prosecutors said.

Mulosmani swung again, and Mujkovic pulled a pistol from his right pants pocket and shot Cionzynski once in the head, prosecutors said.

Cionzynski, of the 4400 block of North Nashville Avenue in Harwood Heights, was pronounced dead at the scene, authorities said.

Mujkovic and Mulosmani left the gas station, got into a silver Saturn and drove away, prosecutors said.

The shooting was captured on surveillance video.

Mujkovic was positively identified as the shooter by Cionzynski’s friend and another witness, who was working behind the register at the gas station, prosecutors said.

Judge Peggy Chiampas ordered Mujkovic held without bond in court Wednesday. He was previously charged with reckless homicide and leaving the scene of an accident in 2013, and is currently on bond in that case.

Mulosmani was arrested in June and charged with first-degree murder, and is next scheduled to appear in court Oct. 12, according to the state’s attorney’s office.