Two men were shot, one fatally, Thursday evening in the Humboldt Park neighborhood on the West Side.

John Mackey, 18, and a 20-year-old man were shot inside a business just before 5:30 p.m. in the 3700 block of West Division when someone came in and opened fire, according to Chicago Police and the Cook County medical examiner’s office.

Mackey was shot in the head, while the older man suffered a gunshot wound to the arm, authorities said.

They were both taken to Mount Sinai Hospital, where Mackey was pronounced dead at 6:06 p.m., authorities said. He lived in the 2600 block of West Potomac Avenue.

The older man’s condition was stabilized.

Police initially said the younger man was 19 years old.