Police think 47-year-old Hermilo Beltran may have been targeted in a robbery.
His widow said police told her Beltran's cell phone was found in the alley after his death, but his wallet was missing.
RELATED: Business owners to discuss safety after father killed in Wrigleyville shooting, alleged robbery
He was shot in an alley behind the restaurant, in the 3400 block of North Clark Street.
Police said no one is in custody and Area Three detectives are investigating the deadly shooting.