Two men were shot — one fatally — early Sunday in the Old Town neighborhood.

About 4 a.m., the men, ages 20 and 30, were shot when someone walked out of a fast food restaurant and opened fire in the 100 block of West Division, according to Chicago Police. The shooter got into a Chevrolet Tahoe and drove away south on Clark Street.

Both men were shot in the back and taken to Northwestern Memorial Hospital, police said.

Marquese Fleming, 20, was pronounced dead at the hospital at 4:55 a.m., according to police and the Cook County medical examiner’s office. He lived in the 100 block of North Larrabee.

The 30-year-old man was in serious condition at the hospital, police said.

The block where the shooting occurred was the target of a recent undercover drug investigation, according to a statement from Ald. Brian Hopkins (2nd). The undercover operation resulted in 16 arrests for drug and robbery offenses. The alderman said he was working with local businesses to collect surveillance video of the shooting to aid police.